diff --git a/client/lib/src/AudioStreamer.ts b/client/lib/src/AudioStreamer.ts
index acb4d928..b3432252 100644
--- a/client/lib/src/AudioStreamer.ts
+++ b/client/lib/src/AudioStreamer.ts
@@ -240,7 +240,7 @@ export const postVoice = async (
     srcId: number,
     dstId: number,
     timestamp: number,
-    convertSize: number,
+    convertChunkNum: number,
     crossFadeLowerValue: number,
     crossFadeOffsetRate: number,
     crossFadeEndRate: number,
@@ -250,7 +250,7 @@ export const postVoice = async (
         srcId,
         dstId,
         timestamp,
-        convertSize,
+        convertChunkNum,
         crossFadeLowerValue,
         crossFadeOffsetRate,
         crossFadeEndRate,
diff --git a/client/lib/webpack.common.js b/client/lib/webpack.common.js
index 61ddc4e4..1d9dfd19 100644
--- a/client/lib/webpack.common.js
+++ b/client/lib/webpack.common.js
@@ -28,6 +28,7 @@ module.exports = {
     },
     plugins: [
         new webpack.ProvidePlugin({
+            Buffer: ["buffer", "Buffer"],
             process: "process/browser",
         }),
     ],
diff --git a/server/restapi/MMVC_Rest_VoiceChanger.py b/server/restapi/MMVC_Rest_VoiceChanger.py
index 14aaf18a..8fd509f9 100644
--- a/server/restapi/MMVC_Rest_VoiceChanger.py
+++ b/server/restapi/MMVC_Rest_VoiceChanger.py
@@ -14,7 +14,10 @@ class VoiceModel(BaseModel):
     srcId: int
     dstId: int
     timestamp: int
-    prefixChunkSize: int
+    convertChunkNum: int
+    crossFadeLowerValue: float
+    crossFadeOffsetRate:float
+    crossFadeEndRate:float
     buffer: str
 
 class MMVC_Rest_VoiceChanger:
@@ -31,7 +34,10 @@ class MMVC_Rest_VoiceChanger:
             srcId = voice.srcId
             dstId = voice.dstId
             timestamp = voice.timestamp
-            prefixChunkSize = voice.prefixChunkSize
+            convertChunkNum = voice.convertChunkNum
+            crossFadeLowerValue = voice.crossFadeLowerValue
+            crossFadeOffsetRate = voice.crossFadeOffsetRate
+            crossFadeEndRate = voice.crossFadeEndRate
             buffer = voice.buffer
             wav = base64.b64decode(buffer)
 
@@ -46,7 +52,7 @@ class MMVC_Rest_VoiceChanger:
 
             self.tlock.acquire()
             changedVoice = self.voiceChangerManager.changeVoice(
-                gpu, srcId, dstId, timestamp, prefixChunkSize, unpackedData)
+                gpu, srcId, dstId, timestamp, convertChunkNum, crossFadeLowerValue, crossFadeOffsetRate, crossFadeEndRate, unpackedData)
             self.tlock.release()
 
             changedVoiceBase64 = base64.b64encode(changedVoice).decode('utf-8')
@@ -55,7 +61,7 @@ class MMVC_Rest_VoiceChanger:
                 "srcId": srcId,
                 "dstId": dstId,
                 "timestamp": timestamp,
-                "prefixChunkSize": prefixChunkSize,
+                "convertChunkNum": voice.convertChunkNum,
                 "changedVoiceBase64": changedVoiceBase64
             }
 
diff --git a/server/voice_changer/VoiceChanger.py b/server/voice_changer/VoiceChanger.py
index 3567c2c8..3053b2ed 100755
--- a/server/voice_changer/VoiceChanger.py
+++ b/server/voice_changer/VoiceChanger.py
@@ -85,7 +85,8 @@ class VoiceChanger():
             print("Cur", self.cur_strength)
             
             # ひとつ前の結果とサイズが変わるため、記録は消去する。
-            delattr(self,"prev_audio1")
+            if hasattr(self, 'prev_audio1') == True:
+                delattr(self,"prev_audio1")
 
 
         try: