/etc/oss4/conf/oss_trident.conf is in oss4-base 4.2-build2007-2.1.
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 | # Open Sound System configuration file
# Remove the '#' in front of the option(s) you like to set.
#
#
# Trident MPU 401 I/O Address
# Values: 0x300, 0x330 Default: 0x330
#
#
#trident_mpu_ioaddr=0
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