[alsa-devel] Strange behaviour in snd-usb-cayak with Audio4DJ

[Pedro Ribeiro]

On 16 February 2010 16:44, Daniel Mack <daniel at caiaq.de> wrote:
> Hi,
>
> On Tue, Feb 16, 2010 at 04:35:29PM +0000, Pedro Ribeiro wrote:
>> ALSA information script output is here
>> http://www.alsa-project.org/db/?f=fe4cc3eda2df49c6055f55d4cef935524124d1a1
>> and my .asoundrc is here  http://pastebin.com/m3f70572d
>>
>> Currently my .asoundrc has 4 devices:
>> - Audio4DJ_A (combines channels 1 and 2)
>> - Audio4DJ_B (combines channels 3 and 4)
>> - Audio4DJ (combines Audio4DJ_A and Audio4DJ_B)
>> - ttable is a device for JACK according to this
>> http://alsa-project.org/main/index.php/Asoundrc#Virtual_multi_channel_devices
>>
>> My goal is to have a separate ALSA soundcard for each pair of
>> channels, an ALSA soundcard for 4 channels and a JACK device for all 4
>> channels.
>>
>> Running speaker-test -c2 -D plughw:Audio4DJ,0,X -twav -l1
>> with X=0 and X=1 correctly outputs to each channel. Also,
>> pcm.Audio4DJ_A and pcm.Audio4DJ_B correctly work through both ALSA and
>> JACK for each pair of channels.
>>
>> However, if I try to use the pcm.Audio4DJ (which combines both
>> pcm.Audio4DJ_A and pcm.Audio4DJ_B), I get correct output through
>> channels 1 and 2, but channels 3 and 4 have a lot of garbage - you can
>> hear the track playing but it is at a very high pitch and distorted.
>
> Could you first try to playback audio without all your quirks using the
> following commands, please.
>
> For channel 1&2: aplay -D plughw:Audio4DJ,0,0 test.wav
> For channel 3&4: aplay -D plughw:Audio4DJ,0,1 test.wav
>
> If that works, we can exclude driver issues. I'm very confident that
> will work btw, as this is the way I tested the driver.
>
> I admittedly have no clue about JACK ;)
>
> Daniel
>
>

Thank you for the quick reply!

it works perfectly! I have no clue why the combined device produces
such garbage when playing on channels 3 and 4.

Pedro