Been using this to create some samples and thought I'd share it with you guys....it's the best I've found so far. No mic?, no problem!, just use a text to speech website such as Elevenlabs or Lazypy to create what you want to put through the vocoder. If the TTS file is saved in a format other than .WAV then you will need to convert it first before dropping it into the vocoder app. It's pretty easy to use but if you have issues, let me know... have fun!.

https://webaudiodemos.appspot.com/Vocoder/index.html
https://elevenlabs.io/
https://lazypy.ro/tts/
https://audio.online-convert.com/convert-to-wav

4OTF