I have to admit that this is getting increasingly interesting even for me. If you had designed it with a physical knob, there would be little hesitation...
The thing is - When I'm driving, I want to change focus as little as possible. An actual knob to change the volume or switch it off makes a world of difference. There's nothing that beats a tactile response to what you're doing. That way it's possible to make adjustments to your musical experience while still keeping your eyes on the road.
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