diff --git a/server/Exceptions.py b/server/Exceptions.py
index 9a2104b4..0ad8fc49 100644
--- a/server/Exceptions.py
+++ b/server/Exceptions.py
@@ -3,9 +3,7 @@ class NoModeLoadedException(Exception):
         self.framework = framework
 
     def __str__(self):
-        return repr(
-            f"No model for {self.framework} loaded. Please confirm the model uploaded."
-        )
+        return repr(f"No model for {self.framework} loaded. Please confirm the model uploaded.")
 
 
 class HalfPrecisionChangingException(Exception):
@@ -36,3 +34,8 @@ class DeviceCannotSupportHalfPrecisionException(Exception):
 class VoiceChangerIsNotSelectedException(Exception):
     def __str__(self):
         return repr("Voice Changer is not selected.")
+
+
+class WeightDownladException(Exception):
+    def __str__(self):
+        return repr("Failed to download weight.")
diff --git a/server/MMVCServerSIO.py b/server/MMVCServerSIO.py
index bbf3ac99..26c79ce4 100755
--- a/server/MMVCServerSIO.py
+++ b/server/MMVCServerSIO.py
@@ -1,4 +1,3 @@
-from concurrent.futures import ThreadPoolExecutor
 import sys
 
 from distutils.util import strtobool
@@ -7,11 +6,9 @@ import socket
 import platform
 import os
 import argparse
-from Downloader import download, download_no_tqdm
-from voice_changer.RVC.SampleDownloader import (
-    checkRvcModelExist,
-    downloadInitialSampleModels,
-)
+from Exceptions import WeightDownladException
+from utils.downloader.SampleDownloader import downloadInitialSamples
+from utils.downloader.WeightDownloader import downloadWeight
 
 from voice_changer.utils.VoiceChangerParams import VoiceChangerParams
 
@@ -24,7 +21,6 @@ from const import (
     NATIVE_CLIENT_FILE_MAC,
     NATIVE_CLIENT_FILE_WIN,
     SSL_KEY_DIR,
-    getRVCSampleJsonAndModelIds,
 )
 import subprocess
 import multiprocessing as mp
@@ -35,56 +31,23 @@ setup_loggers()
 
 def setupArgParser():
     parser = argparse.ArgumentParser()
-    parser.add_argument(
-        "--logLevel",
-        type=str,
-        default="critical",
-        help="Log level info|critical. (default: critical)",
-    )
+    parser.add_argument("--logLevel", type=str, default="critical", help="Log level info|critical. (default: critical)")
     parser.add_argument("-p", type=int, default=18888, help="port")
     parser.add_argument("--https", type=strtobool, default=False, help="use https")
-    parser.add_argument(
-        "--httpsKey", type=str, default="ssl.key", help="path for the key of https"
-    )
-    parser.add_argument(
-        "--httpsCert", type=str, default="ssl.cert", help="path for the cert of https"
-    )
-    parser.add_argument(
-        "--httpsSelfSigned",
-        type=strtobool,
-        default=True,
-        help="generate self-signed certificate",
-    )
+    parser.add_argument("--httpsKey", type=str, default="ssl.key", help="path for the key of https")
+    parser.add_argument("--httpsCert", type=str, default="ssl.cert", help="path for the cert of https")
+    parser.add_argument("--httpsSelfSigned", type=strtobool, default=True, help="generate self-signed certificate")
 
     parser.add_argument("--model_dir", type=str, help="path to model files")
-    parser.add_argument(
-        "--rvc_sample_mode", type=str, default="production", help="rvc_sample_mode"
-    )
+    parser.add_argument("--sample_mode", type=str, default="production", help="rvc_sample_mode")
 
-    parser.add_argument(
-        "--content_vec_500", type=str, help="path to content_vec_500 model(pytorch)"
-    )
-    parser.add_argument(
-        "--content_vec_500_onnx", type=str, help="path to content_vec_500 model(onnx)"
-    )
-    parser.add_argument(
-        "--content_vec_500_onnx_on",
-        type=strtobool,
-        default=False,
-        help="use or not onnx for  content_vec_500",
-    )
-    parser.add_argument(
-        "--hubert_base", type=str, help="path to hubert_base model(pytorch)"
-    )
-    parser.add_argument(
-        "--hubert_base_jp", type=str, help="path to hubert_base_jp model(pytorch)"
-    )
-    parser.add_argument(
-        "--hubert_soft", type=str, help="path to hubert_soft model(pytorch)"
-    )
-    parser.add_argument(
-        "--nsf_hifigan", type=str, help="path to nsf_hifigan model(pytorch)"
-    )
+    parser.add_argument("--content_vec_500", type=str, help="path to content_vec_500 model(pytorch)")
+    parser.add_argument("--content_vec_500_onnx", type=str, help="path to content_vec_500 model(onnx)")
+    parser.add_argument("--content_vec_500_onnx_on", type=strtobool, default=False, help="use or not onnx for  content_vec_500")
+    parser.add_argument("--hubert_base", type=str, help="path to hubert_base model(pytorch)")
+    parser.add_argument("--hubert_base_jp", type=str, help="path to hubert_base_jp model(pytorch)")
+    parser.add_argument("--hubert_soft", type=str, help="path to hubert_soft model(pytorch)")
+    parser.add_argument("--nsf_hifigan", type=str, help="path to nsf_hifigan model(pytorch)")
 
     return parser
 
@@ -111,76 +74,19 @@ def printMessage(message, level=0):
             print(f"\033[47m    {message}\033[0m")
 
 
-def downloadWeight():
-    # content_vec_500 = (args.content_vec_500,)
-    # content_vec_500_onnx = (args.content_vec_500_onnx,)
-    # content_vec_500_onnx_on = (args.content_vec_500_onnx_on,)
-    hubert_base = args.hubert_base
-    hubert_base_jp = args.hubert_base_jp
-    hubert_soft = args.hubert_soft
-    nsf_hifigan = args.nsf_hifigan
-
-    # file exists check (currently only for rvc)
-    downloadParams = []
-    if os.path.exists(hubert_base) is False:
-        downloadParams.append(
-            {
-                "url": "https://huggingface.co/ddPn08/rvc-webui-models/resolve/main/embeddings/hubert_base.pt",
-                "saveTo": hubert_base,
-                "position": 0,
-            }
-        )
-    if os.path.exists(hubert_base_jp) is False:
-        downloadParams.append(
-            {
-                "url": "https://huggingface.co/rinna/japanese-hubert-base/resolve/main/fairseq/model.pt",
-                "saveTo": hubert_base_jp,
-                "position": 1,
-            }
-        )
-    if os.path.exists(hubert_soft) is False:
-        downloadParams.append(
-            {
-                "url": "https://huggingface.co/wok000/weights/resolve/main/ddsp-svc30/embedder/hubert-soft-0d54a1f4.pt",
-                "saveTo": hubert_soft,
-                "position": 2,
-            }
-        )
-    if os.path.exists(nsf_hifigan) is False:
-        downloadParams.append(
-            {
-                "url": "https://huggingface.co/wok000/weights/resolve/main/ddsp-svc30/nsf_hifigan_20221211/model.bin",
-                "saveTo": nsf_hifigan,
-                "position": 3,
-            }
-        )
-    nsf_hifigan_config = os.path.join(os.path.dirname(nsf_hifigan), "config.json")
-
-    if os.path.exists(nsf_hifigan_config) is False:
-        downloadParams.append(
-            {
-                "url": "https://huggingface.co/wok000/weights/raw/main/ddsp-svc30/nsf_hifigan_20221211/config.json",
-                "saveTo": nsf_hifigan_config,
-                "position": 4,
-            }
-        )
-
-    with ThreadPoolExecutor() as pool:
-        pool.map(download, downloadParams)
-
-    if (
-        os.path.exists(hubert_base) is False
-        or os.path.exists(hubert_base_jp) is False
-        or os.path.exists(hubert_soft) is False
-        or os.path.exists(nsf_hifigan) is False
-        or os.path.exists(nsf_hifigan_config) is False
-    ):
-        printMessage("RVC用のモデルファイルのダウンロードに失敗しました。", level=2)
-        printMessage("failed to download weight for rvc", level=2)
-
-
 parser = setupArgParser()
 args, unknown = parser.parse_known_args()
+voiceChangerParams = VoiceChangerParams(
+    model_dir=args.model_dir,
+    content_vec_500=args.content_vec_500,
+    content_vec_500_onnx=args.content_vec_500_onnx,
+    content_vec_500_onnx_on=args.content_vec_500_onnx_on,
+    hubert_base=args.hubert_base,
+    hubert_base_jp=args.hubert_base_jp,
+    hubert_soft=args.hubert_soft,
+    nsf_hifigan=args.nsf_hifigan,
+    sample_mode=args.sample_mode,
+)
 
 printMessage(f"Booting PHASE :{__name__}", level=2)
 
@@ -199,24 +105,6 @@ def localServer(logLevel: str = "critical"):
 
 if __name__ == "MMVCServerSIO":
     mp.freeze_support()
-    voiceChangerParams = VoiceChangerParams(
-        model_dir=args.model_dir,
-        content_vec_500=args.content_vec_500,
-        content_vec_500_onnx=args.content_vec_500_onnx,
-        content_vec_500_onnx_on=args.content_vec_500_onnx_on,
-        hubert_base=args.hubert_base,
-        hubert_base_jp=args.hubert_base_jp,
-        hubert_soft=args.hubert_soft,
-        nsf_hifigan=args.nsf_hifigan,
-        rvc_sample_mode=args.rvc_sample_mode,
-    )
-
-    if (
-        os.path.exists(voiceChangerParams.hubert_base) is False
-        or os.path.exists(voiceChangerParams.hubert_base_jp) is False
-    ):
-        printMessage("RVC用のモデルファイルのダウンロードに失敗しました。", level=2)
-        printMessage("failed to download weight for rvc", level=2)
 
     voiceChangerManager = VoiceChangerManager.get_instance(voiceChangerParams)
     app_fastapi = MMVC_Rest.get_instance(voiceChangerManager, voiceChangerParams)
@@ -230,24 +118,20 @@ if __name__ == "__main__":
     mp.freeze_support()
 
     printMessage("Voice Changerを起動しています。", level=2)
-
-    # ダウンロード
-    downloadWeight()
-    os.makedirs(args.model_dir, exist_ok=True)
-
+    # ダウンロード(Weight)
     try:
-        sampleJsons = []
-        sampleJsonUrls, sampleModels = getRVCSampleJsonAndModelIds(args.rvc_sample_mode)
-        for url in sampleJsonUrls:
-            filename = os.path.basename(url)
-            download_no_tqdm({"url": url, "saveTo": filename, "position": 0})
-            sampleJsons.append(filename)
-        if checkRvcModelExist(args.model_dir) is False:
-            downloadInitialSampleModels(sampleJsons, sampleModels, args.model_dir)
+        downloadWeight(voiceChangerParams)
+    except WeightDownladException:
+        printMessage("RVC用のモデルファイルのダウンロードに失敗しました。", level=2)
+        printMessage("failed to download weight for rvc", level=2)
+
+    # ダウンロード(Sample)
+    try:
+        downloadInitialSamples(args.sample_mode, args.model_dir)
     except Exception as e:
         print("[Voice Changer] loading sample failed", e)
 
-    PORT = args.p
+    # PORT = args.p
 
     if os.getenv("EX_PORT"):
         EX_PORT = os.environ["EX_PORT"]
@@ -280,9 +164,7 @@ if __name__ == "__main__":
         )
         key_path = os.path.join(SSL_KEY_DIR, keyname)
         cert_path = os.path.join(SSL_KEY_DIR, certname)
-        printMessage(
-            f"protocol: HTTPS(self-signed), key:{key_path}, cert:{cert_path}", level=1
-        )
+        printMessage(f"protocol: HTTPS(self-signed), key:{key_path}, cert:{cert_path}", level=1)
 
     elif args.https and args.httpsSelfSigned == 0:
         # HTTPS
@@ -336,16 +218,12 @@ if __name__ == "__main__":
         p.start()
         try:
             if sys.platform.startswith("win"):
-                process = subprocess.Popen(
-                    [NATIVE_CLIENT_FILE_WIN, "-u", f"http://localhost:{PORT}/"]
-                )
+                process = subprocess.Popen([NATIVE_CLIENT_FILE_WIN, "-u", f"http://localhost:{PORT}/"])
                 return_code = process.wait()
                 print("client closed.")
                 p.terminate()
             elif sys.platform.startswith("darwin"):
-                process = subprocess.Popen(
-                    [NATIVE_CLIENT_FILE_MAC, "-u", f"http://localhost:{PORT}/"]
-                )
+                process = subprocess.Popen([NATIVE_CLIENT_FILE_MAC, "-u", f"http://localhost:{PORT}/"])
                 return_code = process.wait()
                 print("client closed.")
                 p.terminate()
diff --git a/server/const.py b/server/const.py
index 63d3bc69..c5c18cc7 100644
--- a/server/const.py
+++ b/server/const.py
@@ -5,6 +5,14 @@ import tempfile
 from typing import Literal, TypeAlias
 
 
+VoiceChangerType: TypeAlias = Literal[
+    "MMVCv13",
+    "MMVCv15",
+    "so-vits-svc-40",
+    "DDSP-SVC",
+    "RVC",
+]
+
 ModelType: TypeAlias = Literal[
     "MMVCv15",
     "MMVCv13",
@@ -22,16 +30,8 @@ tmpdir = tempfile.TemporaryDirectory()
 # print("generate tmpdir:::",tmpdir)
 SSL_KEY_DIR = os.path.join(tmpdir.name, "keys") if hasattr(sys, "_MEIPASS") else "keys"
 MODEL_DIR = os.path.join(tmpdir.name, "logs") if hasattr(sys, "_MEIPASS") else "logs"
-UPLOAD_DIR = (
-    os.path.join(tmpdir.name, "upload_dir")
-    if hasattr(sys, "_MEIPASS")
-    else "upload_dir"
-)
-NATIVE_CLIENT_FILE_WIN = (
-    os.path.join(sys._MEIPASS, "voice-changer-native-client.exe")  # type: ignore
-    if hasattr(sys, "_MEIPASS")
-    else "voice-changer-native-client"
-)
+UPLOAD_DIR = os.path.join(tmpdir.name, "upload_dir") if hasattr(sys, "_MEIPASS") else "upload_dir"
+NATIVE_CLIENT_FILE_WIN = os.path.join(sys._MEIPASS, "voice-changer-native-client.exe") if hasattr(sys, "_MEIPASS") else "voice-changer-native-client"  # type: ignore
 NATIVE_CLIENT_FILE_MAC = (
     os.path.join(
         sys._MEIPASS,  # type: ignore
@@ -44,25 +44,15 @@ NATIVE_CLIENT_FILE_MAC = (
     else "voice-changer-native-client"
 )
 
-HUBERT_ONNX_MODEL_PATH = (
-    os.path.join(sys._MEIPASS, "model_hubert/hubert_simple.onnx")  # type: ignore
-    if hasattr(sys, "_MEIPASS")
-    else "model_hubert/hubert_simple.onnx"
-)
+HUBERT_ONNX_MODEL_PATH = os.path.join(sys._MEIPASS, "model_hubert/hubert_simple.onnx") if hasattr(sys, "_MEIPASS") else "model_hubert/hubert_simple.onnx"  # type: ignore
 
 
-TMP_DIR = (
-    os.path.join(tmpdir.name, "tmp_dir") if hasattr(sys, "_MEIPASS") else "tmp_dir"
-)
+TMP_DIR = os.path.join(tmpdir.name, "tmp_dir") if hasattr(sys, "_MEIPASS") else "tmp_dir"
 os.makedirs(TMP_DIR, exist_ok=True)
 
 
 def getFrontendPath():
-    frontend_path = (
-        os.path.join(sys._MEIPASS, "dist")
-        if hasattr(sys, "_MEIPASS")
-        else "../client/demo/dist"
-    )
+    frontend_path = os.path.join(sys._MEIPASS, "dist") if hasattr(sys, "_MEIPASS") else "../client/demo/dist"
     return frontend_path
 
 
@@ -100,80 +90,81 @@ class ServerAudioDeviceTypes(Enum):
     audiooutput = "audiooutput"
 
 
-class RVCSampleMode(Enum):
-    production = "production"
-    testOfficial = "testOfficial"
-    testDDPNTorch = "testDDPNTorch"
-    testDDPNONNX = "testDDPNONNX"
-    testONNXFull = "testONNXFull"
+RVCSampleMode: TypeAlias = Literal[
+    "production",
+    "testOfficial",
+    "testDDPNTorch",
+    "testDDPNONNX",
+    "testONNXFull",
+]
 
 
-def getRVCSampleJsonAndModelIds(mode: RVCSampleMode):
-    if mode == RVCSampleMode.production.value:
+def getSampleJsonAndModelIds(mode: RVCSampleMode):
+    if mode == "production":
         return [
             # "https://huggingface.co/wok000/vcclient_model/raw/main/samples_0001.json",
             # "https://huggingface.co/wok000/vcclient_model/raw/main/samples_0002.json",
-            "https://huggingface.co/wok000/vcclient_model/raw/main/samples_0003_t.json",
-            "https://huggingface.co/wok000/vcclient_model/raw/main/samples_0003_o.json",
+            "https://huggingface.co/wok000/vcclient_model/raw/main/samples_0003_t2.json",
+            "https://huggingface.co/wok000/vcclient_model/raw/main/samples_0003_o2.json",
         ], [
-            ("TokinaShigure_o", True),
-            ("KikotoMahiro_o", False),
-            ("Amitaro_o", False),
-            ("Tsukuyomi-chan_o", False),
+            ("TokinaShigure_o", {"useIndex": True}),
+            ("KikotoMahiro_o", {"useIndex": False}),
+            ("Amitaro_o", {"useIndex": False}),
+            ("Tsukuyomi-chan_o", {"useIndex": False}),
         ]
-    elif mode == RVCSampleMode.testOfficial.value:
+    elif mode == "testOfficial":
         return [
             "https://huggingface.co/wok000/vcclient_model/raw/main/test/test_official_v1_v2.json",
             "https://huggingface.co/wok000/vcclient_model/raw/main/test/test_ddpn_v1_v2.json",
         ], [
-            ("test-official-v1-f0-48k-l9-hubert_t", True),
-            ("test-official-v1-nof0-48k-l9-hubert_t", False),
-            ("test-official-v2-f0-40k-l12-hubert_t", False),
-            ("test-official-v2-nof0-40k-l12-hubert_t", False),
-            ("test-official-v1-f0-48k-l9-hubert_o", True),
-            ("test-official-v1-nof0-48k-l9-hubert_o", False),
-            ("test-official-v2-f0-40k-l12-hubert_o", False),
-            ("test-official-v2-nof0-40k-l12-hubert_o", False),
+            ("test-official-v1-f0-48k-l9-hubert_t", {"useIndex": True}),
+            ("test-official-v1-nof0-48k-l9-hubert_t", {"useIndex": False}),
+            ("test-official-v2-f0-40k-l12-hubert_t", {"useIndex": False}),
+            ("test-official-v2-nof0-40k-l12-hubert_t", {"useIndex": False}),
+            ("test-official-v1-f0-48k-l9-hubert_o", {"useIndex": True}),
+            ("test-official-v1-nof0-48k-l9-hubert_o", {"useIndex": False}),
+            ("test-official-v2-f0-40k-l12-hubert_o", {"useIndex": False}),
+            ("test-official-v2-nof0-40k-l12-hubert_o", {"useIndex": False}),
         ]
-    elif mode == RVCSampleMode.testDDPNTorch.value:
+    elif mode == "testDDPNTorch":
         return [
             "https://huggingface.co/wok000/vcclient_model/raw/main/test/test_official_v1_v2.json",
             "https://huggingface.co/wok000/vcclient_model/raw/main/test/test_ddpn_v1_v2.json",
         ], [
-            ("test-ddpn-v1-f0-48k-l9-hubert_t", False),
-            ("test-ddpn-v1-nof0-48k-l9-hubert_t", False),
-            ("test-ddpn-v2-f0-40k-l12-hubert_t", False),
-            ("test-ddpn-v2-nof0-40k-l12-hubert_t", False),
-            ("test-ddpn-v2-f0-40k-l12-hubert_jp_t", False),
-            ("test-ddpn-v2-nof0-40k-l12-hubert_jp_t", False),
+            ("test-ddpn-v1-f0-48k-l9-hubert_t", {"useIndex": False}),
+            ("test-ddpn-v1-nof0-48k-l9-hubert_t", {"useIndex": False}),
+            ("test-ddpn-v2-f0-40k-l12-hubert_t", {"useIndex": False}),
+            ("test-ddpn-v2-nof0-40k-l12-hubert_t", {"useIndex": False}),
+            ("test-ddpn-v2-f0-40k-l12-hubert_jp_t", {"useIndex": False}),
+            ("test-ddpn-v2-nof0-40k-l12-hubert_jp_t", {"useIndex": False}),
         ]
-    elif mode == RVCSampleMode.testDDPNONNX.value:
+    elif mode == "testDDPNONNX":
         return [
             "https://huggingface.co/wok000/vcclient_model/raw/main/test/test_official_v1_v2.json",
             "https://huggingface.co/wok000/vcclient_model/raw/main/test/test_ddpn_v1_v2.json",
         ], [
-            ("test-ddpn-v1-f0-48k-l9-hubert_o", False),
-            ("test-ddpn-v1-nof0-48k-l9-hubert_o", False),
-            ("test-ddpn-v2-f0-40k-l12-hubert_o", False),
-            ("test-ddpn-v2-nof0-40k-l12-hubert_o", False),
-            ("test-ddpn-v2-f0-40k-l12-hubert_jp_o", False),
-            ("test-ddpn-v2-nof0-40k-l12-hubert_jp_o", False),
+            ("test-ddpn-v1-f0-48k-l9-hubert_o", {"useIndex": False}),
+            ("test-ddpn-v1-nof0-48k-l9-hubert_o", {"useIndex": False}),
+            ("test-ddpn-v2-f0-40k-l12-hubert_o", {"useIndex": False}),
+            ("test-ddpn-v2-nof0-40k-l12-hubert_o", {"useIndex": False}),
+            ("test-ddpn-v2-f0-40k-l12-hubert_jp_o", {"useIndex": False}),
+            ("test-ddpn-v2-nof0-40k-l12-hubert_jp_o", {"useIndex": False}),
         ]
-    elif mode == RVCSampleMode.testONNXFull.value:
+    elif mode == "testONNXFull":
         return [
             "https://huggingface.co/wok000/vcclient_model/raw/main/test/test_official_v1_v2.json",
             "https://huggingface.co/wok000/vcclient_model/raw/main/test/test_ddpn_v1_v2.json",
         ], [
-            ("test-official-v1-f0-48k-l9-hubert_o_full", False),
-            ("test-official-v1-nof0-48k-l9-hubert_o_full", False),
-            ("test-official-v2-f0-40k-l12-hubert_o_full", False),
-            ("test-official-v2-nof0-40k-l12-hubert_o_full", False),
-            ("test-ddpn-v1-f0-48k-l9-hubert_o_full", False),
-            ("test-ddpn-v1-nof0-48k-l9-hubert_o_full", False),
-            ("test-ddpn-v2-f0-40k-l12-hubert_o_full", False),
-            ("test-ddpn-v2-nof0-40k-l12-hubert_o_full", False),
-            ("test-ddpn-v2-f0-40k-l12-hubert_jp_o_full", False),
-            ("test-ddpn-v2-nof0-40k-l12-hubert_jp_o_full", False),
+            ("test-official-v1-f0-48k-l9-hubert_o_full", {"useIndex": False}),
+            ("test-official-v1-nof0-48k-l9-hubert_o_full", {"useIndex": False}),
+            ("test-official-v2-f0-40k-l12-hubert_o_full", {"useIndex": False}),
+            ("test-official-v2-nof0-40k-l12-hubert_o_full", {"useIndex": False}),
+            ("test-ddpn-v1-f0-48k-l9-hubert_o_full", {"useIndex": False}),
+            ("test-ddpn-v1-nof0-48k-l9-hubert_o_full", {"useIndex": False}),
+            ("test-ddpn-v2-f0-40k-l12-hubert_o_full", {"useIndex": False}),
+            ("test-ddpn-v2-nof0-40k-l12-hubert_o_full", {"useIndex": False}),
+            ("test-ddpn-v2-f0-40k-l12-hubert_jp_o_full", {"useIndex": False}),
+            ("test-ddpn-v2-nof0-40k-l12-hubert_jp_o_full", {"useIndex": False}),
         ]
     else:
         return [], []
diff --git a/server/data/ModelSample.py b/server/data/ModelSample.py
new file mode 100644
index 00000000..b7df3b4c
--- /dev/null
+++ b/server/data/ModelSample.py
@@ -0,0 +1,37 @@
+from dataclasses import dataclass, field
+from typing import TypeAlias, Union, Any
+from const import VoiceChangerType
+
+
+@dataclass
+class ModelSample:
+    id: str = ""
+    voiceChangerType: VoiceChangerType | None = None
+
+
+@dataclass
+class RVCModelSample(ModelSample):
+    voiceChangerType: VoiceChangerType = "RVC"
+    lang: str = ""
+    tag: list[str] = field(default_factory=lambda: [])
+    name: str = ""
+    modelUrl: str = ""
+    indexUrl: str = ""
+    termsOfUseUrl: str = ""
+    icon: str = ""
+    credit: str = ""
+    description: str = ""
+
+    sampleRate: int = 48000
+    modelType: str = ""
+    f0: bool = True
+
+
+ModelSamples: TypeAlias = Union[ModelSample, RVCModelSample]
+
+
+def generateModelSample(params: Any) -> ModelSamples:
+    if params["voiceChangerType"] == "RVC":
+        return RVCModelSample(**params)
+    else:
+        return ModelSample(**{k: v for k, v in params.items() if k in ModelSample.__annotations__})
diff --git a/server/data/ModelSlot.py b/server/data/ModelSlot.py
new file mode 100644
index 00000000..1087d90c
--- /dev/null
+++ b/server/data/ModelSlot.py
@@ -0,0 +1,59 @@
+from typing import TypeAlias, Union
+from const import EnumInferenceTypes, EnumEmbedderTypes, VoiceChangerType
+
+from dataclasses import dataclass, asdict
+
+import os
+import json
+
+
+@dataclass
+class ModelSlot:
+    voiceChangerType: VoiceChangerType | None = None
+
+
+@dataclass
+class RVCModelSlot(ModelSlot):
+    voiceChangerType: VoiceChangerType = "RVC"
+    modelFile: str = ""
+    indexFile: str = ""
+    defaultTune: int = 0
+    defaultIndexRatio: int = 1
+    defaultProtect: float = 0.5
+    isONNX: bool = False
+    modelType: str = EnumInferenceTypes.pyTorchRVC.value
+    samplingRate: int = -1
+    f0: bool = True
+    embChannels: int = 256
+    embOutputLayer: int = 9
+    useFinalProj: bool = True
+    deprecated: bool = False
+    embedder: str = EnumEmbedderTypes.hubert.value
+
+    name: str = ""
+    description: str = ""
+    credit: str = ""
+    termsOfUseUrl: str = ""
+    sampleId: str = ""
+    iconFile: str = ""
+
+
+ModelSlots: TypeAlias = Union[ModelSlot, RVCModelSlot]
+
+
+def loadSlotInfo(model_dir: str, slotIndex: int) -> ModelSlots:
+    slotDir = os.path.join(model_dir, str(slotIndex))
+    jsonFile = os.path.join(slotDir, "params.json")
+    if not os.path.exists(jsonFile):
+        return ModelSlot()
+    jsonDict = json.load(open(os.path.join(slotDir, "params.json")))
+    slotInfo = ModelSlot(**{k: v for k, v in jsonDict.items() if k in ModelSlot.__annotations__})
+    if slotInfo.voiceChangerType == "RVC":
+        return RVCModelSlot(**jsonDict)
+    else:
+        return ModelSlot()
+
+
+def saveSlotInfo(model_dir: str, slotIndex: int, slotInfo: ModelSlots):
+    slotDir = os.path.join(model_dir, str(slotIndex))
+    json.dump(asdict(slotInfo), open(os.path.join(slotDir, "params.json"), "w"))
diff --git a/server/samples_0003_o.json b/server/samples_0003_o.json
deleted file mode 100644
index 18a7e967..00000000
--- a/server/samples_0003_o.json
+++ /dev/null
@@ -1,79 +0,0 @@
-{
-  "RVC": [
-    {
-      "id": "KikotoKurage_o",
-      "lang": "ja-JP",
-      "tag": ["v2", "onnx"],
-      "name": "黄琴海月(onnx)",
-      "modelUrl": "https://huggingface.co/wok000/vcclient_model/resolve/main/rvc_v2_alpha/kikoto_kurage/kikoto_kurage_v2_40k_e100_simple.onnx",
-      "indexUrl": "https://huggingface.co/wok000/vcclient_model/resolve/main/rvc_v2_alpha/kikoto_kurage/added_IVF5181_Flat_nprobe_1_v2.index.bin",
-      "termsOfUseUrl": "https://huggingface.co/wok000/vcclient_model/raw/main/rvc_v2_alpha/kikoto_kurage/terms_of_use.txt",
-      "icon": "https://huggingface.co/wok000/vcclient_model/resolve/main/rvc_v2_alpha/kikoto_kurage/kikoto_kurage.png",
-      "credit": "黄琴海月",
-      "description": "",
-      "sampleRate": 40000,
-      "modelType": "rvc_v2",
-      "f0": true
-    },
-    {
-      "id": "KikotoMahiro_o",
-      "lang": "ja-JP",
-      "tag": ["v2", "onnx"],
-      "name": "黄琴まひろ(onnx)",
-      "modelUrl": "https://huggingface.co/wok000/vcclient_model/resolve/main/rvc_v2_alpha/kikoto_mahiro/kikoto_mahiro_v2_40k_simple.onnx",
-      "indexUrl": "https://huggingface.co/wok000/vcclient_model/resolve/main/rvc_v2_alpha/kikoto_mahiro/added_IVF6881_Flat_nprobe_1_v2.index.bin",
-      "termsOfUseUrl": "https://huggingface.co/wok000/vcclient_model/raw/main/rvc_v2_alpha/kikoto_mahiro/terms_of_use.txt",
-      "icon": "https://huggingface.co/wok000/vcclient_model/resolve/main/rvc_v2_alpha/kikoto_mahiro/kikoto_mahiro.png",
-      "credit": "黄琴まひろ",
-      "description": "",
-      "sampleRate": 40000,
-      "modelType": "rvc_v2",
-      "f0": true
-    },
-    {
-      "id": "TokinaShigure_o",
-      "lang": "ja-JP",
-      "tag": ["v2", "onnx"],
-      "name": "刻鳴時雨(onnx)",
-      "modelUrl": "https://huggingface.co/wok000/vcclient_model/resolve/main/rvc_v2_alpha/tokina_shigure/tokina_shigure_v2_40k_e100_simple.onnx",
-      "indexUrl": "https://huggingface.co/wok000/vcclient_model/resolve/main/rvc_v2_alpha/tokina_shigure/added_IVF2736_Flat_nprobe_1_v2.index.bin",
-      "termsOfUseUrl": "https://huggingface.co/wok000/vcclient_model/raw/main/rvc_v2_alpha/tokina_shigure/terms_of_use.txt",
-      "icon": "https://huggingface.co/wok000/vcclient_model/resolve/main/rvc_v2_alpha/tokina_shigure/tokina_shigure.png",
-      "credit": "刻鳴時雨",
-      "description": "",
-      "sampleRate": 40000,
-      "modelType": "rvc_v2",
-      "f0": true
-    },
-    {
-      "id": "Amitaro_o",
-      "lang": "ja-JP",
-      "tag": ["v2", "onnx"],
-      "name": "あみたろ(onnx)",
-      "modelUrl": "https://huggingface.co/wok000/vcclient_model/resolve/main/rvc_v2_alpha/amitaro/amitaro_v2_40k_e100_simple.onnx",
-      "indexUrl": "https://huggingface.co/wok000/vcclient_model/resolve/main/rvc_v2_alpha/amitaro/added_IVF3139_Flat_nprobe_1_v2.index.bin",
-      "termsOfUseUrl": "https://huggingface.co/wok000/vcclient_model/raw/main/rvc_v2_alpha/amitaro/terms_of_use.txt",
-      "icon": "https://huggingface.co/wok000/vcclient_model/resolve/main/rvc_v2_alpha/amitaro/amitaro.png",
-      "credit": "あみたろ",
-      "description": "",
-      "sampleRate": 40000,
-      "modelType": "rvc_v2",
-      "f0": true
-    },
-    {
-      "id": "Tsukuyomi-chan_o",
-      "lang": "ja-JP",
-      "tag": ["v2", "onnx"],
-      "name": "つくよみちゃん(onnx)",
-      "modelUrl": "https://huggingface.co/wok000/vcclient_model/resolve/main/rvc_v2_alpha/tsukuyomi-chan/tsukuyomi_v2_40k_e100_simple.onnx",
-      "indexUrl": "https://huggingface.co/wok000/vcclient_model/resolve/main/rvc_v2_alpha/tsukuyomi-chan/added_IVF7852_Flat_nprobe_1_v2.index.bin",
-      "termsOfUseUrl": "https://huggingface.co/wok000/vcclient_model/raw/main/rvc_v2_alpha/tsukuyomi-chan/terms_of_use.txt",
-      "icon": "https://huggingface.co/wok000/vcclient_model/resolve/main/rvc_v2_alpha/tsukuyomi-chan/tsukuyomi-chan.png",
-      "credit": "つくよみちゃん",
-      "description": "",
-      "sampleRate": 40000,
-      "modelType": "rvc_v2",
-      "f0": true
-    }
-  ]
-}
diff --git a/server/utils/downloader/Downloader.py b/server/utils/downloader/Downloader.py
new file mode 100644
index 00000000..1b346f90
--- /dev/null
+++ b/server/utils/downloader/Downloader.py
@@ -0,0 +1,56 @@
+import requests  # type: ignore
+import os
+from tqdm import tqdm
+
+
+def download(params):
+    url = params["url"]
+    saveTo = params["saveTo"]
+    position = params["position"]
+    dirname = os.path.dirname(saveTo)
+    if dirname != "":
+        os.makedirs(dirname, exist_ok=True)
+
+    try:
+        req = requests.get(url, stream=True, allow_redirects=True)
+        content_length = req.headers.get("content-length")
+        progress_bar = tqdm(
+            total=int(content_length) if content_length is not None else None,
+            leave=False,
+            unit="B",
+            unit_scale=True,
+            unit_divisor=1024,
+            position=position,
+        )
+
+        # with tqdm
+        with open(saveTo, "wb") as f:
+            for chunk in req.iter_content(chunk_size=1024):
+                if chunk:
+                    progress_bar.update(len(chunk))
+                    f.write(chunk)
+
+    except Exception as e:
+        print(e)
+
+
+def download_no_tqdm(params):
+    url = params["url"]
+    saveTo = params["saveTo"]
+    dirname = os.path.dirname(saveTo)
+    if dirname != "":
+        os.makedirs(dirname, exist_ok=True)
+    try:
+        req = requests.get(url, stream=True, allow_redirects=True)
+        with open(saveTo, "wb") as f:
+            countToDot = 0
+            for chunk in req.iter_content(chunk_size=1024):
+                if chunk:
+                    f.write(chunk)
+                    countToDot += 1
+                    if countToDot % 1024 == 0:
+                        print(".", end="", flush=True)
+
+        print("+", end="", flush=True)
+    except Exception as e:
+        print(e)
diff --git a/server/utils/downloader/SampleDownloader.py b/server/utils/downloader/SampleDownloader.py
new file mode 100644
index 00000000..12e77696
--- /dev/null
+++ b/server/utils/downloader/SampleDownloader.py
@@ -0,0 +1,166 @@
+import json
+import os
+from concurrent.futures import ThreadPoolExecutor
+from typing import Any, Tuple
+
+from const import RVCSampleMode, getSampleJsonAndModelIds
+from data.ModelSample import ModelSamples, generateModelSample
+from data.ModelSlot import RVCModelSlot, loadSlotInfo, saveSlotInfo
+from voice_changer.RVC.ModelSlotGenerator import _setInfoByONNX, _setInfoByPytorch
+from utils.downloader.Downloader import download, download_no_tqdm
+
+
+def downloadInitialSamples(mode: RVCSampleMode, model_dir: str):
+    sampleJsonUrls, sampleModels = getSampleJsonAndModelIds(mode)
+    sampleJsons = _downloadSampleJsons(sampleJsonUrls)
+    if os.path.exists(model_dir):
+        print("[Voice Changer] model_dir is already exists. skil download samples.")
+        return
+    samples = _generateSampleList(sampleJsons)
+    slotIndex = list(range(len(sampleModels)))
+    _downloadSamples(samples, sampleModels, model_dir, slotIndex)
+
+    pass
+
+
+def downloadSample(mode: RVCSampleMode, modelId: str, model_dir: str, slotIndex: int, params: Any):
+    sampleJsonUrls, _sampleModels = getSampleJsonAndModelIds(mode)
+    sampleJsons = _generateSampleJsons(sampleJsonUrls)
+    samples = _generateSampleList(sampleJsons)
+    _downloadSamples(samples, [(modelId, params)], model_dir, [slotIndex])
+    pass
+
+
+def getSampleInfos(mode: RVCSampleMode):
+    sampleJsonUrls, _sampleModels = getSampleJsonAndModelIds(mode)
+    sampleJsons = _generateSampleJsons(sampleJsonUrls)
+    samples = _generateSampleList(sampleJsons)
+    return samples
+
+
+def _downloadSampleJsons(sampleJsonUrls: list[str]):
+    sampleJsons = []
+    for url in sampleJsonUrls:
+        filename = os.path.basename(url)
+        download_no_tqdm({"url": url, "saveTo": filename, "position": 0})
+        sampleJsons.append(filename)
+    return sampleJsons
+
+
+def _generateSampleJsons(sampleJsonUrls: list[str]):
+    sampleJsons = []
+    for url in sampleJsonUrls:
+        filename = os.path.basename(url)
+        sampleJsons.append(filename)
+    return sampleJsons
+
+
+def _generateSampleList(sampleJsons: list[str]):
+    samples: list[ModelSamples] = []
+    for file in sampleJsons:
+        with open(file, "r", encoding="utf-8") as f:
+            jsonDict = json.load(f)
+        for vcType in jsonDict:
+            for sampleParams in jsonDict[vcType]:
+                sample = generateModelSample(sampleParams)
+                samples.append(sample)
+    return samples
+
+
+def _downloadSamples(samples: list[ModelSamples], sampleModelIds: list[Tuple[str, Any]], model_dir: str, slotIndex: list[int]):
+    downloadParams = []
+    line_num = 0
+
+    for i, initSampleId in enumerate(sampleModelIds):
+        targetSampleId = initSampleId[0]
+        targetSampleParams = initSampleId[1]
+        tagetSlotIndex = slotIndex[i]
+
+        # 初期サンプルをサーチ
+        match = False
+        for sample in samples:
+            if sample.id == targetSampleId:
+                match = True
+                break
+        if match is False:
+            print(f"[Voice Changer] initiail sample not found. {targetSampleId}")
+            continue
+
+        # 検出されたら、、、
+        slotDir = os.path.join(model_dir, str(tagetSlotIndex))
+        if sample.voiceChangerType == "RVC":
+            slotInfo: RVCModelSlot = RVCModelSlot()
+
+            os.makedirs(slotDir, exist_ok=True)
+            modelFilePath = os.path.join(
+                slotDir,
+                os.path.basename(sample.modelUrl),
+            )
+            downloadParams.append(
+                {
+                    "url": sample.modelUrl,
+                    "saveTo": modelFilePath,
+                    "position": line_num,
+                }
+            )
+            slotInfo.modelFile = modelFilePath
+            line_num += 1
+
+            if targetSampleParams["useIndex"] is True and hasattr(sample, "indexUrl") and sample.indexUrl != "":
+                indexPath = os.path.join(
+                    slotDir,
+                    os.path.basename(sample.indexUrl),
+                )
+                downloadParams.append(
+                    {
+                        "url": sample.indexUrl,
+                        "saveTo": indexPath,
+                        "position": line_num,
+                    }
+                )
+                slotInfo.indexFile = indexPath
+                line_num += 1
+
+            if hasattr(sample, "icon") and sample.icon != "":
+                iconPath = os.path.join(
+                    slotDir,
+                    os.path.basename(sample.icon),
+                )
+                downloadParams.append(
+                    {
+                        "url": sample.icon,
+                        "saveTo": iconPath,
+                        "position": line_num,
+                    }
+                )
+                slotInfo.iconFile = iconPath
+                line_num += 1
+
+            slotInfo.sampleId = sample.id
+            slotInfo.credit = sample.credit
+            slotInfo.description = sample.description
+            slotInfo.name = sample.name
+            slotInfo.termsOfUseUrl = sample.termsOfUseUrl
+            slotInfo.defaultTune = 0
+            slotInfo.defaultIndexRatio = 1
+            slotInfo.defaultProtect = 0.5
+            slotInfo.isONNX = slotInfo.modelFile.endswith(".onnx")
+            saveSlotInfo(model_dir, tagetSlotIndex, slotInfo)
+        else:
+            print(f"[Voice Changer] {sample.voiceChangerType} is not supported.")
+
+    # ダウンロード
+    print("[Voice Changer] Downloading model files...")
+    with ThreadPoolExecutor() as pool:
+        pool.map(download, downloadParams)
+
+    # メタデータ作成
+    print("[Voice Changer] Generating metadata...")
+    for targetSlotIndex in slotIndex:
+        slotInfo = loadSlotInfo(model_dir, targetSlotIndex)
+        if slotInfo.voiceChangerType == "RVC":
+            if slotInfo.isONNX:
+                _setInfoByONNX(slotInfo)
+            else:
+                _setInfoByPytorch(slotInfo)
+        saveSlotInfo(model_dir, targetSlotIndex, slotInfo)
diff --git a/server/utils/downloader/WeightDownloader.py b/server/utils/downloader/WeightDownloader.py
new file mode 100644
index 00000000..1bb42ef8
--- /dev/null
+++ b/server/utils/downloader/WeightDownloader.py
@@ -0,0 +1,64 @@
+import os
+from concurrent.futures import ThreadPoolExecutor
+
+from utils.downloader.Downloader import download
+from voice_changer.utils.VoiceChangerParams import VoiceChangerParams
+from Exceptions import WeightDownladException
+
+
+def downloadWeight(voiceChangerParams: VoiceChangerParams):
+    hubert_base = voiceChangerParams.hubert_base
+    hubert_base_jp = voiceChangerParams.hubert_base_jp
+    hubert_soft = voiceChangerParams.hubert_soft
+    nsf_hifigan = voiceChangerParams.nsf_hifigan
+
+    # file exists check (currently only for rvc)
+    downloadParams = []
+    if os.path.exists(hubert_base) is False:
+        downloadParams.append(
+            {
+                "url": "https://huggingface.co/ddPn08/rvc-webui-models/resolve/main/embeddings/hubert_base.pt",
+                "saveTo": hubert_base,
+                "position": 0,
+            }
+        )
+    if os.path.exists(hubert_base_jp) is False:
+        downloadParams.append(
+            {
+                "url": "https://huggingface.co/rinna/japanese-hubert-base/resolve/main/fairseq/model.pt",
+                "saveTo": hubert_base_jp,
+                "position": 1,
+            }
+        )
+    if os.path.exists(hubert_soft) is False:
+        downloadParams.append(
+            {
+                "url": "https://huggingface.co/wok000/weights/resolve/main/ddsp-svc30/embedder/hubert-soft-0d54a1f4.pt",
+                "saveTo": hubert_soft,
+                "position": 2,
+            }
+        )
+    if os.path.exists(nsf_hifigan) is False:
+        downloadParams.append(
+            {
+                "url": "https://huggingface.co/wok000/weights/resolve/main/ddsp-svc30/nsf_hifigan_20221211/model.bin",
+                "saveTo": nsf_hifigan,
+                "position": 3,
+            }
+        )
+    nsf_hifigan_config = os.path.join(os.path.dirname(nsf_hifigan), "config.json")
+
+    if os.path.exists(nsf_hifigan_config) is False:
+        downloadParams.append(
+            {
+                "url": "https://huggingface.co/wok000/weights/raw/main/ddsp-svc30/nsf_hifigan_20221211/config.json",
+                "saveTo": nsf_hifigan_config,
+                "position": 4,
+            }
+        )
+
+    with ThreadPoolExecutor() as pool:
+        pool.map(download, downloadParams)
+
+    if os.path.exists(hubert_base) is False or os.path.exists(hubert_base_jp) is False or os.path.exists(hubert_soft) is False or os.path.exists(nsf_hifigan) is False or os.path.exists(nsf_hifigan_config) is False:
+        raise WeightDownladException()
diff --git a/server/voice_changer/utils/VoiceChangerParams.py b/server/voice_changer/utils/VoiceChangerParams.py
index 47e4855a..51f83995 100644
--- a/server/voice_changer/utils/VoiceChangerParams.py
+++ b/server/voice_changer/utils/VoiceChangerParams.py
@@ -11,4 +11,4 @@ class VoiceChangerParams:
     hubert_base_jp: str
     hubert_soft: str
     nsf_hifigan: str
-    rvc_sample_mode: str
+    sample_mode: str