Voicemod can modify incoming voice through another application, e.g.: Voicemeeter.
This is how to set up Voicemod with Voicemeeter Banana:
Set Voicemod Virtual microphone as your default system microphone (Control Panel > Sound > Recording Tab > Set Voicemod Virtual microphone as the Default device).
System settings:
Voicemod settings:
Here is also a video tutorial: https://www.youtube.com/watch?v=WVLcX2o4naE
Remember to reverse the changes once you have finished!