On Tue, Jun 2, 2009 at 3:25 AM, Clemens Ladisch <cladisch@xxxxxxxxxxxxxx> wrote: > Michael B Allen wrote: >> Does capture work with the M-Audio Fast Track USB? > > Maybe. Does some capture device show up in the output of "arecord -l"? Yes. And I have been able to get capture to work but it is very faint and distorted. Here is what I have done so far so that the other people who were interested in this can play along: # arecord -l **** List of CAPTURE Hardware Devices **** card 0: Intel [HDA Intel], device 0: AD198x Analog [AD198x Analog] Subdevices: 2/2 Subdevice #0: subdevice #0 Subdevice #1: subdevice #1 card 1: Track [Fast Track], device 0: USB Audio [USB Audio] Subdevices: 1/1 Subdevice #0: subdevice #0 After inseting the Fast Track: # cat /proc/asound/devices 2: : timer 3: : sequencer 4: [ 0- 1]: digital audio playback 5: [ 0- 0]: digital audio playback 6: [ 0- 0]: digital audio capture 7: [ 0- 0]: hardware dependent 8: [ 0] : control 9: [ 1- 0]: digital audio playback 10: [ 1- 0]: digital audio capture 11: [ 1] : control So item 10 looks like card 1 subdevice 0 is "digital audio capture". But then again "digital audio playback" is also card 1 subdevice 0? >> Can someone give me some advice or a pointer to some documentation >> that explains how the whole ALSA tool chain works wrt external USB >> sound recording? > > You can tell any ALSA program to use a specific device by using a device > name like "plughw:x,y" if you know the card and device numbers. So this means the device identifier for the Fast Track with my particular hardware setup is: plughw:1,0 > If you're using PulseAudio, you have to tell it to use that device. Can I bypass PulseAudio and stick to the commandline? If I do: # arecord -D plughw:1,0 /tmp/test.wav and then do: # aplay -Dplughw:1,0 /tmp/test.wav Playing WAVE '/tmp/test.wav' : Unsigned 8 bit, Rate 8000 Hz, Mono at first, this produced silence. Then I realized I could do: # alsamixer -c 1 to run alsamixer with card 1. Now I can see Capture was turned OFF. So if I go to Capture and hit the space bar to turn it ON and then turn it up to 97%: # amixer -c 1 Simple mixer control 'PCM',0 Capabilities: pvolume pswitch pswitch-joined Playback channels: Front Left - Front Right Limits: Playback 0 - 256 Mono: Front Left: Playback 192 [75%] [-31.50dB] [on] Front Right: Playback 192 [75%] [-31.50dB] [on] Simple mixer control 'Mic',0 Capabilities: cvolume cswitch cswitch-joined Capture channels: Front Left - Front Right Limits: Capture 0 - 128 Front Left: Capture 124 [97%] [-3.00dB] [on] Front Right: Capture 124 [97%] [-3.00dB] [on] and do arecord again just like before I can play it back and it works but it is very faint and distorted. So this proves capture signal is making it to ALSA. However why is it so faint? I suppose it is distorted because I have the level set to -3dB? Mike ------------------------------------------------------------------------------ OpenSolaris 2009.06 is a cutting edge operating system for enterprises looking to deploy the next generation of Solaris that includes the latest innovations from Sun and the OpenSource community. Download a copy and enjoy capabilities such as Networking, Storage and Virtualization. Go to: http://p.sf.net/sfu/opensolaris-get _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
