/etc/oss4/conf/oss_imux.conf is in oss4-base 4.2-build2010-5ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 | # Open Sound System configuration file
# Remove the '#' in front of the option(s) you like to set.
#
#
# IMUX supports multiple instances, please consult the man page
#
#
#
# Number of IMUX client side devices to configure.
# Values: 2-48 Default: 5.
#
#
#imux_devices=5
#
#
# Master physical device to use (ie attach IMUX to a specific soundcard)
# -1 means automatically detect the device. Use the device index numbers
# reported by ossinfo -a.
# Values: 0-N Default: -1 (autodetec)
#
#
#imux_masterdev=-1
#
#
# Select the base sampling rate for the IMUX device. The base rate must be
# one supported by the actual physical device (as reported by audioinfo -a -v2).
# Values: 8000-192000 Default: 48000
#
#imux_rate=48000
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