[linux-audio-user] Multiple Cards(sorry, i know it's an ancient topic)

[paul santa clara]

On May 24, 2006, at 8:32 AM, Rick Wright wrote:

> paul santa clara wrote:
>
>> Hi everyone,
>>     I am attempting to utilize my asound.conf to create a virtual   
>> interface out of two delta 410 cards.  There are several examples  
>> of  this online, but even after digesting them and plunging into  
>> the ALSA  doxygen docs, i am still unable to make jackd happy.   
>> My  understanding is that a route plug is inefficient but  
>> necessary for  jack to lock down the memory(unless the  
>> MMAP_COMPLEX patch is  applied).   Using jack 0.99.0
>>
>> jackd -v -d alsa -P ttable_play         results in the error...
>> ALSA lib pcm_multi.c:970:(_snd_pcm_multi_open) Unknown field 10
>> ALSA: Cannot open PCM device alsa_pcm for playback.  Falling back  
>> to  capture-only mode.
>>
>> The playback  portion of my asound.conf follows.  Any help would  
>> be  greatly appreciated.  I actually thought I understood the   
>> configuration process until it failed to work. ;)
>>
>> thanks in advance,
>> -paul
>>
>> pcm.multi_playback {
>>      type multi
>>      slaves.a.pcm hw:1                   <----------------------  
>> "hw:0"?
>>      slaves.a.pcm channels 10
>>      slaves.b.pcm hw:2                   <----------------------  
>> "hw:1"?
>>      slaves.b.pcm channels 10
>> #note that ice1217 chip actually has 10 outs(8 analogue on 410)
>
> I don't know much about .asoundrc configuration, but should the  
> "hw" index start at 0?

Yeppers, but AlSA defines card 0 to be my main board's built in audio.
card 0 -> CK8S
card 1 -> M410
card 2 -> M410

thanks,
-paul