[Alsa-user] Softvol plug in with usb audio

[Quentin b. <qu...@go...>]

Hi everybody!

(My first post, wooohoo!)

I have a probleme with a usb audio device who don't have hardware mixing 
=> no volume control. So I wanted to setup the softvol pcm plugin.
But I am totally lost in /usr/share/alsa/alsa.conf !
So, there's my questions :

1) Is that true that /etc/asound.conf override alsa.conf ?

2) What am I doing wrong in :
----------- asound.conf ----------------
pcm.!default {
    type plug
    slave.pcm {
       type softvol
       slave.pcm {
          type hw
          card hw:0,0
        }
       control {
          name mixer
          card 0
       }
    }
}
-----------------------------------------
3) Will there be a new /dev/sound/mixerX if it succeed ? If not how to 
control the softvol plugin.

4) Will that work with oss emulation ?

Thanks !

Quentin Berthet