usb sound card - device order

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Hello,

I guess this is a newbie question, but I have searched and tried several things without result (maybe because I misunderstood something).

My problem is that :
I have an usb sound that I want to use by default.
Which means I also have other sound cards...

My ~/.asoundrc is as follow:
pcm.!default {
        type plug
        slave.pcm {
                type hw
                card 0
                device 0
        }
}

But, sometimes, the device order is modified, which I can confirm with "aplay -l".

I have tried methods here without result:
http://alsa.opensrc.org/MultipleCards#The_older_.22index.3D.22_method


Then I just tried to define the index to 0 in my /etc/modprobe.d/alsa-base.conf, but it doesn't seem to change anything...

# autoloader aliases
install sound-slot-0 /sbin/modprobe snd-card-0
install sound-slot-1 /sbin/modprobe snd-card-1
install sound-slot-2 /sbin/modprobe snd-card-2
install sound-slot-3 /sbin/modprobe snd-card-3
install sound-slot-4 /sbin/modprobe snd-card-4
install sound-slot-5 /sbin/modprobe snd-card-5
install sound-slot-6 /sbin/modprobe snd-card-6
install sound-slot-7 /sbin/modprobe snd-card-7
# Cause optional modules to be loaded above generic modules
install snd /sbin/modprobe --ignore-install snd && { /sbin/modprobe --quiet snd-ioctl32 ; /sbin/modprobe --quiet snd-seq ; : ; }
install snd-rawmidi /sbin/modprobe --ignore-install snd-rawmidi && { /sbin/modprobe --quiet snd-seq-midi ; : ; }
install snd-emu10k1 /sbin/modprobe --ignore-install snd-emu10k1 && { /sbin/modprobe --quiet snd-emu10k1-synth ; : ; }
# Keep snd-pcsp from beeing loaded as first soundcard
#options snd-pcsp index=1
# Keep snd-usb-audio from beeing loaded as first soundcard
options snd-usb-audio index=0
# Prevent abnormal drivers from grabbing index 0
options bt87x index=-2
options cx88_alsa index=-2
options snd-atiixp-modem index=-2
options snd-intel8x0m index=-2
options snd-via82xx-modem index=-2


Do you an idea of what the problem could be?

Thanks in advance (and sorry for my English)...




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