Urgh. Don't know.
There's a thread buried somewhere here which contains the algorithm.
I know it's different from iPeng's which in turn also is not purely
proportional.

I believe it's a good idea not to have a purely proportional response
because you have to cope with offsets as well as different scales.

* offsets: if two players are intentionally set to different (real)
volume levels you want to keep the difference and a small proportional
change would have a big effect on the loud player but only a small one
on the silent player
* scales: Radio and Boom don't have a linear volume response, if you
change volume on them the same way as on, say, a Transporter ypu get
strange results.

And then there is the issue that strictly going proportional give you
very bad results at very low volumes effectively leveling the volumes
when you go towards low volumes and back up a few times due to
rounding.

Can't speak for SyncOptions but iPeng uses a value that is based on the
relative as well as the absolute change. I believe that generally the
result is pretty good almost nobody complained so far and it's enabled
by default in iPeng so I'm sure someone would if it was completely off.


-- 
pippin

---
see iPeng, the Squeezebox iPhone remote and 
*New: iPeng for iPad*, at penguinlovesmusic.com
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View this thread: http://forums.slimdevices.com/showthread.php?t=93028

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