If you are receiving this message in Voicemod:
Input device in use
"Microphone is being used by another application in exclusive mode and Voicemod is not able to use it..."
...and you have installed Windows 10 version 1803 (April 2018 update), your issue can be related with the new Privacy behavior on Windows 10.
With Windows 10 version 1803 (April 2018 update), Microsoft changed the behavior of microphone app access setting so that it affects desktop applications as well. If the problem started after recent windows 10 version 1803 upgrade then you must first follow the steps below to get back microphone working back.
- Open Settings (Windows Key + I ) > Privacy > Microphone
- Set allow access to the Microphone on this device.
- Allow apps to access your microphone – Make it ON.
- Now Voicemod app should work as normal.