[LAU] Combining two stereo devices on one card into one four-channel device (M-Audio FastTrack Pro)

Hi, I have an M-Audio FastTrack pro (http://www.m-audio.com/products/en_us/FastTrackPro.html), which presents its four playback channels as two devices  (hw:1,0 + hw:1,1). I want to combine the two devices into one, so I can use all channels in Jack - but I'm struggling to get it working or even be sure that I understand .asoundrc Amongst other things, I have tried using the config from http://www.mail-archive.com/alsa-user@lists.sourceforge.net/msg23839.html, but it doesn't work: $ aplay -vv -Dftpro:1,0 test.wav ALSA lib conf.c:4612:(snd_config_expand) Load defaults error: File exists ALSA lib pcm.c:2211:(snd_pcm_open_noupdate) Unknown PCM ftpro:1,0 aplay: main:608: audio open error: File exists Full alsa-info.sh output: http://www.alsa-project.org/db/?f=0fc7694be834a5bcaba51317a0660de22911a02f Another .asoundrc I've tried: ----8<---- pcm.fasttrackmulti {  type multi  slaves.a.pcm "hw:1,0";  slaves.a.channels 2  slaves.b.pcm "hw:1,1";  slaves.b.channels 2 # First 2 channels of first soundcard (playback)  bindings.0.slave a  bindings.0.channel 0  bindings.1.slave a  bindings.1.channel 1 # First 2 channels of second soundcard (playback)  bindings.2.slave b  bindings.2.channel 0  bindings.3.slave b  bindings.3.channel 1 } ctl.fasttrackmulti {  type hw  card 2 } ----8<---- There is never any sign of the .asoundrc devices in aplay -l output. Any ideas how I can get it working? Thanks in advance for any help! Cheers, Dave -- http://www.witchesband.com/