multiple soundcards and mplayer in slave mode can't change volume

[bastiaan@…]

I have system with 3 soundcards. I open three terminals and I start 3 instances
of mplayer in slave mode. When I send the command:

volume 1

through all three terminals a bug occurs. All the instances of mplayer change
only the volume on the first card. This is obviously a bug. I can't control the
volume of any of the other cards through the slave mode.

I use debian unstable with 1.0pre6 and I have alsa installed.

I run player with the following commands:

mplayer -ao alsa:device=hw=0 -loop 0 -shuffle -slave /mnt/muziek1/*
mplayer -ao alsa:device=hw=1 -loop 0 -shuffle -slave /mnt/muziek2/*
mplayer -ao alsa:device=hw=2 -loop 0 -shuffle -slave /mnt/muziek3/*

Please fix it.

[reimar]

You must use the -mixer option if you want MPlayer to use a different mixer.
Maybe a more sensible default could be derived from the ALSA device name, but
I'm not certain...
So I think this is a usage error => marking INVALID