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Accessing rear channels on soundcard

Posted: Mon Jun 23, 2008 4:44 pm
by moonskin
Hi everyone.

Can anybody point me in the right direction to find out how to access the rear channels on my soundcard?

It's a CMI8738-MC6 and I'm running 64Studio(Debian Etch).

I want to have a second instance of jconv sending to the rear channels of my soundcard via Jack but I have very little idea how to do it. I followed some instructions I found to create a virtual device with .asoundrc which I followed. aplay -L says it is there but when I try to use it in Jack, it says it is already in use.

Any pointers would be most welcome.


Re: Accessing rear channels on soundcard

Posted: Tue Jun 24, 2008 12:37 pm
by moonskin
I'll answer my own post (for the record) because I found out how to do it. (My apologies to those who already know this stuff.)

In qjackctrl -> setup, type 'surround41' into the "interface" box and set the output channels to 4. I'm not sure whether it is necessary but I also set it to playback only rather than duplex. This gives you access to front and rear. I assume (but have not tried) that setting the output channels to 5 will let you access the LFE channel.

If you have a 5.1 card and want to access the centre channel, use surround51 as the interface.