I'm new to this whole linux sound thing, and I'd like to get my M-Audio Quattro USB working. sorry if this email is a little long, i just want to go ahead and put most of my information up now, so you all aren't asking for it later. so far, i can play from XMMS using it's ALSA driver, I can send/receive midi data. i can refer to it as quattro1, quattro2, etc, as outlined in the standard .asoundrc (which i'll put at the end). i haven't even touched recording yet there's two problems i'm having. 1) when i do a $ aplay --device quattro1 test.wav I can hear it, but it's choppy and it get this: Playing WAVE 'test.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo underrun!!! (at least 0.079 ms long) underrun!!! (at least 0.038 ms long) underrun!!! (at least 0.046 ms long) underrun!!! (at least 0.039 ms long) ... same if i just use aplay --device hw:1 when I try --device quattro I get aplay: set_params:837: Channels count non available the second problem I'm having, is I can't get the Quattro to work under JACK. If I try duplex mode, I get this in my message window: 22:07:32.554 /usr/bin/jackstart -R -dalsa -dhw:1 -r48000 -p1024 -n2 -i2 -o2 22:07:32.627 JACK was started with PID=3974 (0xf86). back from read, ret = 1 errno == Success jackd 0.94.0 Copyright 2001-2003 Paul Davis and others. jackd comes with ABSOLUTELY NO WARRANTY This is free software, and you are welcome to redistribute it under certain conditions; see the file COPYING for details loading driver .. apparent rate = 48000 creating alsa driver ... hw:1|hw:1|1024|2|48000|2|2|nomon|swmeter|rt|32bit control device hw:1 configuring for 48000Hz, period = 1024 frames, buffer = 2 periods Couldn't open hw:1 for 32bit samples trying 24bit instead Couldn't open hw:1 for 32bit samples trying 24bit instead could not start playback (Broken pipe) DRIVER NT: could not start driver cannot start driver 22:07:33.937 JACK was stopped successfully. 22:07:35.861 Could not connect to JACK server as client. if I only set for playback, then I get a bunch of clicking and a bunch of XRUN callbacks. if anyone could help me out, I'd really appreciate it. thanks! here's some info: $ more /proc/asound/cards 0 [AudioPCI ]: ENS1371 - Ensoniq AudioPCI Ensoniq AudioPCI ENS1371 at 0x1080, irq 11 1 [Quattro ]: USB-Audio - USB Audio Quattro M Audio USB Audio Quattro at usb-00:07.2-2, full speed $ more .asoundrc # quattro1 is pcm0 which has a maximum sample rate of 44100 and 16 # bit stereo pcm.quattro1 { type hw card 1 device 0 } ctl.quattro1 { type hw card 1 } # quattro2 is pcm1 which has a maximum sample rate of 96000 and 24 # bit stereo pcm.quattro2 { type hw card 1 device 1 } ctl.quattro2 { type hw card 1 } #---- # # compose 4 channels from two channel x two devices, hw:2,1 and # hw:2,2 # assuming that hw:2,1 and hw:2,2 give the same condition, 24_3LE/96k # 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. # Use plug instead of route here, since 24_3LE is unlikely supported # by applications. # # arecord -r 44100 -c 4 -f s16_le -D q4 -d 5 /home/xxx/q4.wav 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 for applications that do support 24_3LE # This lowers latency which the plug plugin introduces due to # resampling. # # arecord -r 44100 -c 4 -f s16_le -D q4b -d 5 /home/xxx/q41.wav pcm.q4b { type route; slave.pcm "quattro"; ttable.0.0 1; ttable.1.1 1; ttable.2.2 1; ttable.3.3 1; } ctl.q4b { type hw; card 1; }