On Fri, 2013-07-05 at 11:09 +0800, gMAIL wrote: > It seems work... > > [Lzy1 at Lzy ~]$ cat /proc/asound/cards > 0 [SB ]: HDA-Intel - HDA ATI SB > HDA ATI SB at 0xfe8f4000 irq 16 > 1 [C400 ]: USB-Audio - Fast Track C400 > M-Audio Fast Track C400 at usb-0000:00:13.2-3, > high speed > > but I cannot find fast track c400 on the sound setting panel. Typically pro-audio sound cards don't have alsa configuration that PulseAudio would be able to use without extra work. PulseAudio depends on there being a device called "front" for stereo playback, or "surround51" for 5.1 playback. Probably those devices are missing from the alsa configuration. It's probably possible to support the card in PulseAudio by writing a custom profile-set configuration file for it. Here is some documentation for how to do it: http://www.freedesktop.org/wiki/Software/PulseAudio/Backends/ALSA/Profiles/ Here you can find the existing sound card specific profile set files, which may be useful as examples: http://cgit.freedesktop.org/pulseaudio/pulseaudio/tree/src/modules/alsa/mixer/profile-sets If you write a profile set file for Fast Track C400, please send it to the mailing list so that we can support the card in future PulseAudio versions. -- Tanu
