how to set up surround soun

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Everything works perfectly in ordinary stereo (two channel) mode.

But,

$ aplay -L 
 null 
     Discard all samples (playback) or generate zero samples (capture) 
 default:CARD=MID 
     HDA Intel MID, ALC889 Analog 
     Default Audio Device 
 sysdefault:CARD=MID 
     HDA Intel MID, ALC889 Analog 
     Default Audio Device 
 front:CARD=MID,DEV=0 
     HDA Intel MID, ALC889 Analog 
     Front speakers 
 surround21:CARD=MID,DEV=0 
     HDA Intel MID, ALC889 Analog 
     2.1 Surround output to Front and Subwoofer speakers 
 surround40:CARD=MID,DEV=0 
     HDA Intel MID, ALC889 Analog 
     4.0 Surround output to Front and Rear speakers 
 surround41:CARD=MID,DEV=0 
     HDA Intel MID, ALC889 Analog 
     4.1 Surround output to Front, Rear and Subwoofer speakers 
 surround50:CARD=MID,DEV=0 
     HDA Intel MID, ALC889 Analog 
     5.0 Surround output to Front, Center and Rear speakers 
 surround51:CARD=MID,DEV=0 
     HDA Intel MID, ALC889 Analog 
     5.1 Surround output to Front, Center, Rear and Subwoofer speakers 
 surround71:CARD=MID,DEV=0 
     HDA Intel MID, ALC889 Analog 
     7.1 Surround output to Front, Center, Side, Rear and Woofer speakers 
 iec958:CARD=MID,DEV=0 
     HDA Intel MID, ALC889 Digital 
     IEC958 (S/PDIF) Digital Audio Output


$ /usr/bin/speaker-test -c 6 -t wav 

 speaker-test 1.0.28 

 Playback device is default 
 Stream parameters are 48000Hz, S16_LE, 6 channels 
 WAV file(s) 
 Rate set to 48000Hz (requested 48000Hz) 
 Buffer size range from 2048 to 16384 
 Period size range from 1024 to 1024 
 Using max buffer size 16384 
 Periods = 4 
 was set period_size = 1024 
 was set buffer_size = 16384 
  0 - Front Left 
  1 - Front Right 
  2 - Unused 
  3 - Unused 
  4 - Unused 
  5 - Unused 
 Time per period = 8.298641 

 $ /usr/bin/speaker-test -c 6 -D surround51 -t wav 

 speaker-test 1.0.28 

 Playback device is surround51 
 Stream parameters are 48000Hz, S16_LE, 6 channels 
 WAV file(s) 
 Playback open error: -16,Device or resource busy

How do I access channels beyond the first two?

Thanks.

Nuzhna

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