Puppy Linux Discussion Forum

[outsider]

Doesn anyone know how to create a virtual sound card in alsa?
I want to have a virtual card displayed when I run 'cat /proc/asound/cards'

I've looked at the alsa site, scoured the web... Hoping someone can point me in the right direction...

[GuestToo]

i'm not sure, but i think you would need to set up an alias in /etc/modprobe.conf ... though Puppy tends to reconfigure things every time it boots

you can set up as many virtual cards as you like in /etc/asound.conf or /root/.asoundrc, and they will be instantly available ... but they won't be listed in /proc/asound/cards

for example, you can set gxine or xmms to use whichever virtual card you like

for example, this might be a duplicate of your card 0, named "mycard":

pcm.mycard {
type hw
card 0
}

this would make the default sound card "mycard":

pcm.!default mycard

so if you typed this, mplayer would use mycard:

mplayer -ao alsa movie.avi

or you could select which card mplayer will use like this:

mplayer -ao alsa:device=mycard movie.avi

you can see what cards you have to choose from by typing:

aplay -L

if you have 4 speakers, you could create a virtual device that duplicates the sound in the front speakers and plays the sound in the rear speakers too:

pcm.40dup {
type route
slave.pcm surround40
slave.channels 4
ttable.0.0 1
ttable.1.1 1
ttable.0.2 1
ttable.1.3 1
}

you could play a movie using 40dup like this:

mplayer -ao alsa:device=40dup movie.avi

you could make "40dup" (or name it anything you like) the default sound card to use like this:

pcm.!default 40dup

[outsider]