[MPlayer-dev-eng] new slave volume control command

[j.a.l]

- i'm hacking on a frontend for mplayer ( namp ) and while including 
sound control, i've thought there is a slave command missing, one that 
set volume with static value, instead inc / dec ( what's little borring 
for front end with its own control ), like "set_volume <left> <right>".

There're all functions already in mplayer ( mixer_setvolume, ... ), i 
could  do it kickly ( if not the job of anybody else... ), just tell me 
what release i must use ( 0.9pre6, cvs 0814... )