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:

       •  8-96Khz Playback/Recording

       •  8 or 16 or 32 bits

       •  2, 4, 6 or 8 channel audio.

       •  SPDIF digital output and Input

       •  AC3 passthrough

       •  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

                                         03 December 2013                              oss_usb(7)