It would be desirable to move the audio fading logic over to the squeezebox itself, deprecating the use of multiple volume adjustments sent by the server.

This could be implemented by adding a transitionTime parameter to audg, specifying how long the volume adjustment should take.  fade_volume() for the SB2 and more recent would call upon this.

It might also be worthwhile using the transitionTime parameter with the strm command when pausing and unpausing.  If two separate commands are used to fade out and pause (audg, then strmp shortly after), there's no guaruntee that the timing will be correct leading to audible gliches.  Using a single command that initiates both on the squeezebox would solve the problem.

Whilst this would simplify maintaining synchronisation between SB2+ (a single pause it sent to each at the same time), some reworking would probably need to be done the algorithm to maintain synchronisation between SB2+ and pre SB2s.