diff --git a/server/sio/MMVC_SocketIOApp.py b/server/sio/MMVC_SocketIOApp.py
index 51db4c5d..ed9ae2dc 100644
--- a/server/sio/MMVC_SocketIOApp.py
+++ b/server/sio/MMVC_SocketIOApp.py
@@ -5,34 +5,36 @@ from voice_changer.VoiceChangerManager import VoiceChangerManager
 from const import getFrontendPath
 
 
-class MMVC_SocketIOApp():
+class MMVC_SocketIOApp:
+    _instance: socketio.ASGIApp | None = None
+
     @classmethod
     def get_instance(cls, app_fastapi, voiceChangerManager: VoiceChangerManager):
-        if not hasattr(cls, "_instance"):
+        if cls._instance is None:
             sio = MMVC_SocketIOServer.get_instance(voiceChangerManager)
             app_socketio = socketio.ASGIApp(
                 sio,
                 other_asgi_app=app_fastapi,
                 static_files={
-                    '/assets/icons/github.svg': {
-                        'filename': f'{getFrontendPath()}/assets/icons/github.svg',
-                        'content_type': 'image/svg+xml'
+                    "/assets/icons/github.svg": {
+                        "filename": f"{getFrontendPath()}/assets/icons/github.svg",
+                        "content_type": "image/svg+xml",
                     },
-                    '/assets/icons/help-circle.svg': {
-                        'filename': f'{getFrontendPath()}/assets/icons/help-circle.svg',
-                        'content_type': 'image/svg+xml'
+                    "/assets/icons/help-circle.svg": {
+                        "filename": f"{getFrontendPath()}/assets/icons/help-circle.svg",
+                        "content_type": "image/svg+xml",
                     },
-                    '/assets/icons/tool.svg': {
-                        'filename': f'{getFrontendPath()}/assets/icons/tool.svg',
-                        'content_type': 'image/svg+xml'
+                    "/assets/icons/tool.svg": {
+                        "filename": f"{getFrontendPath()}/assets/icons/tool.svg",
+                        "content_type": "image/svg+xml",
                     },
-                    '/buymeacoffee.png': {
-                        'filename': f'{getFrontendPath()}/assets/buymeacoffee.png',
-                        'content_type': 'image/png'
+                    "/buymeacoffee.png": {
+                        "filename": f"{getFrontendPath()}/assets/buymeacoffee.png",
+                        "content_type": "image/png",
                     },
-                    '': f'{getFrontendPath()}',
-                        '/': f'{getFrontendPath()}/index.html',
-                }
+                    "": f"{getFrontendPath()}",
+                    "/": f"{getFrontendPath()}/index.html",
+                },
             )
 
             cls._instance = app_socketio
diff --git a/server/sio/MMVC_SocketIOServer.py b/server/sio/MMVC_SocketIOServer.py
index 31a252e6..9f7c0267 100644
--- a/server/sio/MMVC_SocketIOServer.py
+++ b/server/sio/MMVC_SocketIOServer.py
@@ -3,18 +3,17 @@ import socketio
 from sio.MMVC_Namespace import MMVC_Namespace
 from voice_changer.VoiceChangerManager import VoiceChangerManager
 
-class MMVC_SocketIOServer():
+
+class MMVC_SocketIOServer:
+    _instance: socketio.AsyncServer | None = None
+
     @classmethod
-    def get_instance(cls, voiceChangerManager:VoiceChangerManager):
+    def get_instance(cls, voiceChangerManager: VoiceChangerManager):
         if not hasattr(cls, "_instance"):
-            sio = socketio.AsyncServer(
-                    async_mode='asgi',
-                    cors_allowed_origins='*'
-                )
+            sio = socketio.AsyncServer(async_mode="asgi", cors_allowed_origins="*")
             namespace = MMVC_Namespace.get_instance(voiceChangerManager)
             sio.register_namespace(namespace)
             cls._instance = sio
             return cls._instance
 
         return cls._instance
-
diff --git a/server/voice_changer/RVC/RVC.py b/server/voice_changer/RVC/RVC.py
index 16cbf01a..87f65b2a 100644
--- a/server/voice_changer/RVC/RVC.py
+++ b/server/voice_changer/RVC/RVC.py
@@ -325,9 +325,6 @@ class RVC:
         dev = self.deviceManager.getDevice(self.settings.gpu)
         half = self.deviceManager.halfPrecisionAvailable(self.settings.gpu)
 
-        # self.embedder = self.embedder.setDevice(dev)
-        # self.inferencer = self.inferencer.setDevice(dev)
-
         audio = data[0]
         convertSize = data[1]
         vol = data[2]
@@ -365,11 +362,6 @@ class RVC:
 
         result = audio_out * np.sqrt(vol)
 
-        # if self.settings.framework == "ONNX":
-        #     audio = self._onnx_inference(data)
-        # else:
-        #     audio = self._pyTorch_inference(data)
-
         return result
 
     def __del__(self):