I don't think it's really your problem, since you cannot really control every device sound volume, but in future keep track of the sound in your game on general level, so all your games would eventually have basic level of sound. At least for the start it would be nice.
Yes, dash might have 1 second CD, but it feel not intuitive when it performs dash because your pressed it 1sec before.
Just remove register event while it's CD. Or if you want to give a buffer opportunity, give it as last milliseconds.