Provided by: oss4-base_4.2-build2010-5ubuntu1~16.04.2_amd64 
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
09 July 2018 oss_usb(7)