Close Playback stream after soundboard playback completes
Looking at the PulseAudio Volume Control app after pushing some soundboard buttons, it looks like the stream just lingers after playback completes. They only go away after closing the Boatswain app completely.
I think it'd be ideal if Boatswain closed the playback stream after the file finishes playing, so there's not a bunch of them idling. If you push the same button again, it creates yet another new stream anyways, so I see no reason for it to linger.