From the ALSA wiki

Latest revision as of 20:52, 15 March 2009

Put the following into your .asoundrc file. This includes seperate stereo support and four channel support. Remember that the quattro can only do stereo i/o for 96000hz 24bit, 2i/1o or 1i/2o at 48000hz 24bit, 4i/4o at 48000hz 16bit in windows and mac environments. YMMV in Linux :)

.asoundrc

 # The Quattro seems to only have two pcms, not 3.
 # quattro1 is pcm0 

       pcm.quattro1 {
                 type hw
                card 1
        device 0
         }
 
          ctl.quattro1 {
                 type hw
                 card 1
         }
    
 # quattro2 is pcm1 

         pcm.quattro2 {
                 type hw
                card 1
        device 1
         }
 
          ctl.quattro2 {
                 type hw
                 card 1 
         }
 #----    

 #
 # compose 4 channels from two channel x two devices, hw:1,0 and hw:1,1
 #

 pcm.quattro {
        type multi;

        slaves.a.pcm "hw:1,0";
        slaves.a.channels 2;
        slaves.b.pcm "hw:1,1";
        slaves.b.channels 2;

        bindings.0.slave a;
        bindings.0.channel 0;
        bindings.1.slave a;
        bindings.1.channel 1;
        bindings.2.slave b;
        bindings.2.channel 0;
        bindings.3.slave b;
        bindings.3.channel 1;
 }

 ctl.quattro {
        type hw;
        card 1;
 }


 #
 # remap 4 channels as interleaved using plug.
 # 

 pcm.q4 {
        type plug;
        slave.pcm "quattro";
        ttable.0.0 1;
        ttable.1.1 1;
        ttable.2.2 1;
       ttable.3.3 1;
 }



 ctl.q4 {
        type hw;
        card 1;
 }

 #
 # Use route plugin 
 #



 pcm.q41 {
        type route;
        slave.pcm "quattro";
        ttable.0.0 1;
        ttable.1.1 1;
        ttable.2.2 1;
        ttable.3.3 1;

 }

 ctl.q41 {
        type hw;
        card 1;
 }

 #----

See Also

• http://wiki.linuxquestions.org/wiki/M-Audio_Quattro
• http://justinhaynes.com/wiki/index.php?title=Thinkpad_X61s_Fedora_10_PlanetCCRMA_M-Audio_Configuration