I can confirm all these bugs. I have a M-Audio Revolution 5.1 + MSI K9N
Platinum/NVidia 570 MCP/Realtec ALC883/AC'97/Azalia 1.0/Intel HD
Audio/Whatever and I'm  running the AMD64 version of Ubuntu 6.06.

Partial workaround (thanks Nespa):

Open terminal and type:
sudo gedit /etc/modprobe.d/alsa-base

Add the following lines:
options snd-ice1724 index=0
options snd-hda-intel index=1

I suppose there is a way to make alsamixer unmute the left channel at
startup?

It's quite frustrating not to be able to use keyboard volume buttons as
I don't have a volume knob in my active monitor speakers. Only the
volume of the left channel changes, even if the gnome mixer is set to
control both channels at the same time.

Gnome mixer application doesn't work well with the Revolution: it
forgets what tracks it's supposed to show and it has DAC, DAC, DAC 3 and
DAC 3 tracks instead of plain DAC and DAC 1 like alsamixer. Only the
second DAC / DAC 3 affects the sound volume (the changes are mirrored to
the first DAC / DAC 3, but not the other way around).

I wonder if it's possible to write a more user-friendly driver, all the
DACs paired and renamed to Front, Back, etc. according to the card in
use (5.1 or 7.1). A master channel would be nice, too.

-- 
default sound card is randomly set on boot, settting default sound card through 
gnome-sound-properties did not work correctly, changing volume through hotkeys 
(on logitech multimedia keyboard) is bind with card0, not with default card
https://launchpad.net/bugs/45786

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