To uninstall Voicemod swipe in the lower right-hand corner of the screen (notifications) and tap 'All settings', and then tap Apps. You can sort the list of apps by size, name, or install date. If you would like to uninstall Voicemod, select it from the list and then tap or click the uninstall button.
After the uninstallation, restart your computer to be sure that all the Voicemod drivers are deleted.
if after uninstalling and restart you still have problems, check this article Experiencing microphone issues after uninstalling Voicemod.