oss_usb(7)							    OSS Devices 							oss_usb(7)

NAME

       oss_usb - USB Audio/MIDI/Mixer driver

DESCRIPTION

       The Open Sound System driver for USB Audio and MIDI devices.

   AUDIO
       The Audio driver supports:

       o  8-96Khz Playback/Recording

       o  8 or 16 or 32 bits

       o  2, 4, 6 or 8 channel audio.

       o  SPDIF digital output and Input

       o  AC3 passthrough

       o  Volume control and device input mixer

   MIDI
       The  oss_usb driver supports all MIDI devices that are compatible with the official USB MIDI specification. In addition the driver supports
       few devices that use their own private protocol (including some Yamaha and Midiman models).

   USB MIXER
       The USB Audio mixer is a new type of mixer that doesn't have the normal volume controls found on AC97 or Legacy SB devices.  The USB  audio
       mixer provides control for selecting the Alternate device setting - this usually allows the device to be switched into a Professional audio
       mode (eg 24bit or 96Khz mode)

   ALTERNATIVE SETTINGS
       Some USB audio devices use a feature called as alternative settings for bandwidth management. Typically such  devices  have  multiple  high
       speed  inputs  and outputs that may require more bandwidth than provided by the USB bus. The alternative settings feature is used to select
       between multiple low speed devices or just few high speed devices.

       When the device has multiple alternative settings an "altsetting" selector will be visible in the control panel for the	device	(use  oss-
       mix(1) or ossxmix(1) to change it). Alternative setting OFF means that all audio devices are disabled. The other settings provide different
       combinations of high/medium speed devices. You can use the ossinfo(1) command (ossinfo -a -v3) to find out the  devices	supported  by  the
       currently selected alternative settings and the capabilities of them.

KNOWN BUGS

       Under  Linux  it  is necessary to run the ossdetect -d and ossdevlinks commands after an USB device has been hot-plugged. Alternatively you
       can execute soundoff and soundon to reload OSS.

OPTIONS

       None

FILES

       /etc/oss4/conf/oss_usb.conf Device configuration file

AUTHOR

       4Front Technologies

								 16 December 2012							oss_usb(7)