/etc/sysctl.d/50-ubuntustudio.conf is in ubuntustudio-default-settings 0.61.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Setting the ubuntustudio team feels may effect Audio work
# created Sept3 2012 by Len Ovens
# There is some question if changing this will do anything for audio
#fs.inotify.max_user_watches = 524288
# Stock is 60 qjackctl seems to be swapped out too quick at 60.
# the general feeling is that 10 is good for general desktop use too.
vm.swappiness = 10
# Ubuntustudio Testing has yet to prove or disprove this but Rosegarden
# suggests it. The user may uncomment it to use it. Stock is 64, upper limit
# should be 8k, but 3072 is a close match to MIDI hardware.
#dev.hpet.max-user-freq=3072
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