Problem with multiopen on SB Audigy 2

[James Courtier-Dutton <James@superbug.demon.co.uk>]

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?

Cheers
James



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