Re: Multichannel audio playback

[Rodolfo Medina <rodolfo.medina@gmail.com>]

Joel Roth <joelz@pobox.com> writes:

>> So we could consider problem 1) solved.
>> 
>> Let's try to go to problem 2).  The above command properly sends channel 1
>> to loudspeaker 1 and channel 2 to loudspeaker 2, but it doesn't manage to
>> send channel 3 into loudspeaker 3.  Actually, the Behringer seems to behave
>> in stereo mode.  But the strange thing is that outputs `B' (i.e. 3 and 4) do
>> not work at all and seems to be dead.  So please help: how can I - if ever
>> possible - send channel 3 to loudspeaker 3?  And, more in general: is it
>> possible, even with some other device, to achive what I want?
>
> The soundcard capabilities that linux sees are documented
> in the /proc/asound filesystem. That's worth investigating.

Here's the output:

$ cat /proc/asound/cards
 0 [HDMI           ]: HDA-Intel - HDA ATI HDMI
                      HDA ATI HDMI at 0xfea64000 irq 38
 1 [Generic        ]: HDA-Intel - HD-Audio Generic
                      HD-Audio Generic at 0xfea60000 irq 16
 2 [U192k          ]: USB-Audio - UMC404HD 192k
                      BEHRINGER UMC404HD 192k at usb-0000:00:12.0-1.2, high speed

It does not help me...

> Here's one reference to what you can find there:
>
> https://www.ti.com/lit/an/sprac10/sprac10.pdf
>
> Another helpful source for guidance would be the Linux Audio
> Users mailing list, with many knowledgeable and helpful
> members. 

Yes, I wrote to it before buying the Behringer and I will again now.  Some
lister was unkind and called me ignorant...  ;-)

Rodolfo