Update main.ts

main.ts

@@ -24,7 +24,7 @@ async function synthesizeSpeech(model: string, voice: string, text: string) {
     rate = 0.0;
     pitch = 0.0;
 
-    switch (voice) {
+    switch (model) {
       case "ava":
         voiceName = "en-US-AvaMultilingualNeural";
         break;