I've set the volume on my desktop computer to a level that works well for playing YouTube videos, editing my own videos etc. When VarAC sends an alert, I find the volume level to be way too loud. There's currently no way to lower the volume of the VarAC alerts independently of the system audio level.
I would like to see an alert volume slider in the VarAC settings screen which would allow the user to reduce the volume of the alerts from 0 - 100% of the current system volume. A setting of 50%, for example, would mean that the alerts are played at half the volume of regular system sounds and media.