App Volume Control app below would take care of this. Create a rule for Any.Do, set System and Media volumes to zero. Voila! It works for other apps to, but only running in the foreground, Android doesn't allow independent sound control of background apps.
App Volume Control app below would take care of this. Create a rule for Any.Do, set System and Media volumes to zero. Voila! It works for other apps to, but only running in the foreground, Android doesn't allow independent sound control of background apps.
https://play.google.com/store/apps/details?id=com.spycorp.appvolumecontrol&gl=US