[linux-audio-user] Mixer settings

Clemens Ladisch clemens at ladisch.de
Wed Dec 1 13:40:06 EST 2004

Christoph Eckert wrote:
> > USB devices have descriptors that describe all mixer
> > controls and their routing.  You can find this information
> > in the output of "lsusb -v" if you know what to look for.
> Phew, thanks a lot for this hint. Lots of output to read, but
> otherwise it seems to offer all info I'd like to know.

Quick guide:

The bXxxxxID and bSourceID fields specify how the units/terminals are
connected together.

In the bmaControls field, index 0 has controls acting on all channels,
while index 1 and greater specify controls acting on that specific
channel only.


More information about the Linux-audio-user mailing list