Takashi Iwai wrote:
> At Tue, 07 Oct 2003 18:00:22 +0100,
> James Courtier-Dutton wrote:
> 
>>I have 2 sound cards, card 0 is the motherboard intel/alc650 one, and 
>>card 1 is a SB Audigy2
>>
>>Playing two streams at once on device "front:1" works: -
>>aplay -D front:1 filename.wav
>>aplay -D front:1 filename.wav
>>So, this is playing two files to the SB Audigy2 front speakers.
>>I can hear the two files being mixed together and output together to a 
>>single set of speakers.
>>
>>Playing two streams at once on device "rear:1" fails: -
>>aplay -D rear:1 filename.wav
>>aplay -D rear:1 filename.wav
>>So, this is trying to play two files to the SB Audigy2 rear speakers.
>>
>>The first files comes out of the rear speakers, but the output from the 
>>second aplay command fails with: -
>>
>>bash-2.05b# aplay -D rear:1 filename.wav
>>Playing WAVE 'filename.wav' : Signed 16 bit Little Endian, Rate 44100 
>>Hz, Stereo
>>ALSA lib setup.c:94:(snd_sctl_install) Cannot lock ctl elem
>>aplay: set_params:876: Unable to install hw params:
>>ACCESS:  RW_INTERLEAVED
>>FORMAT:  S16_LE
>>SUBFORMAT:  STD
>>SAMPLE_BITS: 16
>>FRAME_BITS: 32
>>CHANNELS: 2
>>RATE: 44100
>>PERIOD_TIME: (125011 125012)
>>PERIOD_SIZE: 5513
>>PERIOD_BYTES: 22052
>>PERIODS: 2
>>BUFFER_TIME: (250022 250023)
>>BUFFER_SIZE: 11026
>>BUFFER_BYTES: 44104
>>TICK_TIME: 1000
>>
>>Can you explain why this might be happening?
> 
> 
> this is because the "Wave Surround Playback Volume" control is locked
> by the first rear stream.
> you can find it in /usr/share/alsa/cards/Audigy2.conf.
> please try to remove the lock.
> 
> 
> Takashi
> 
Thanks that fixed the problem.
Please see attached patch files, for the SB Live and Audigy2, both of 
which have been tested.

Cheers
James