Possible? Not just the volume, mind you. I mean, is there a way to maybe change the "click" sound all together via options? I like being notified when its open and there's a reply, but the sound itself could maybe use a view variants and a method by which to select them? Would that be at all possible in the near future?
It is not currently possible. It will also not be done in the near future, though I'll add it to the list of things to review and add to the development timeline. 
Neat.
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