Provided by: oss4-base_4.2-build2004-1ubuntu2_i386 bug

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
       ossmix(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

                               27 September 2011                    oss_usb(7)