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

                                                13 November 2019                                      oss_usb(7)