Update main.ts

main.ts

@@ -17,13 +17,10 @@ async function fetchVoiceList() {
 
 async function synthesizeSpeech(model: string, voice: string, text: string) {
   let voiceName;
-  let rate = 0;
-  let pitch = 0;
+  let rate = -0.1;
+  let pitch = 0.1;
 
   if (model.includes("tts")) {
-    rate = 0.1;
-    pitch = -0.1;
-
     switch (voice) {
       case "alloy":
         voiceName = "zh-CN-XiaoyiNeural";