Here are the buttons and their defaults:

Button	Press once
Play/Pause	Press once to play & again to pause
Next/FFW	Skip to next MP3
Prev./Rewind	Skip to previous MP3
Volume Wheel	Increase/Decrease Volume (Press in and hold to run AudioPlayer)

Playing songs is just like a normal CD player. AudioPlayer does not have skins like the MiniJam does, but the button layout is pretty good so there isn't really anything to change.  I like the waveform, and I think this is a nice way to show just how close to a normal computer the Visor can come.  Thankfully, the Stop button acts like Pause and doesn't reset the track counter.

You can also play music while in other applications.  Use the hardware buttons on the SoundsGood to change tracks, start/stop the player, and adjust the volume.  I noticed no slowdown when in other applications.  When in another application, press the Volume wheel in (like many cell phones) to return quickly to the AudioPlayer application.  You can even start playing music on the SoundsGood, put the Visor in the cradle, and run a HotSync with no problems!  AudioPlayer does stop, however, when transferring MP3 files.

Battery Life