doesn't seem to work well for me. volume up and down sometimes register 1 count, sometimes 2, sometimes none. Deleted shortly after install, worried about what it's actually doing rather than counting.
this is a commonly reported bug that wasn't able to spot when in development mode.
i think the issue is that i might have attached the volume-button handler multiple times, so that each time you click on the volume button, those duplicated handlers all emit events.
pushed out a small fix currently under apple's review
