Yes. knitCompanion provides a variety of settings for sounds.
- From the home page (5 big buttons) tap the gear upper right
- Notice there are settings for Muting auto play, Counter Sounds, and Marker Sounds.
Note that you can also mute your entire iPad using the system settings, Control Panel, and Side Switch controls of your iPad. knitCompanion sounds are always controlled by the overall settings on your iPad as well as being able to be controlled individually.