Karaoke: Hush on pause
Karaoke: Show the slider with h:m:s instead of just float seconds
Remove the mute/solo buttons from the tab order
Karaoke: Implement {shift,ctrl}+{left,right} to seek within the file - currently buggy

Note that this code is buggy AND it trips a bug in current Pike 7.9
(as of 20130308). Avoid using this unless you are using a patched
Pike. Also avoid using if you want your playback to sound correct,
but that's my bug :)