From bug 3975:

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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.
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Note, for locally-initiated pause, this (or something similar) is already the case.