D: main.c: Started as real root: no, suid root: yes
I: main.c: PolicyKit grants us acquire-high-priority privilege.
I: main.c: PolicyKit grants us acquire-real-time privilege.
I: main.c: setrlimit(RLIMIT_NICE, (31, 31)) failed: Operation not permitted
I: main.c: setrlimit(RLIMIT_RTPRIO, (9, 9)) failed: Operation not permitted
D: main.c: Can realtime: yes, can high-priority: yes
I: main.c: Giving up CAP_NICE
I: main.c: Real-time scheduling enabled in configuration but not allowed by policy.
D: main.c: Can realtime: no, can high-priority: no
I: main.c: Daemon running as PID 4060

# Configuration file for set_rlimits.  Format is:
#
#   name   program   max_nice_priority  max_realtime_priority
# or
#   name   program   <key>=<value> ...
#
# name is expected to be a username, a groupname if preceeded by a @ sign,
# or ALL (which matches all users).  Negative priorities effectively
# disallow any setting of the respective priority for the matching entry.
# <key> can be rtprio, nice or memlock.
# Example entry:
#
#   mark  /usr/local/bin/jackd  -1  80
#
# Here, user mark can execute /usr/local/bin/jackd using set_rlimits to set
# a realtime priority up to and including 80, but setting of a nice priority
# through set_rlimits is disallowed.  Alternatively, if an `audio' group
# existed, the entry
#
#   @audio  /usr/local/bin/jackd  -1  80
#
# would allow the same except the permission would extend to all members of
# the `audio' group.  The same effect could be achieved with the key/value
# syntax:
#
#   @audio  /usr/local/bin/jackd  nice=-1  rtprio=80
#
# For more details on the format and use of this file please refer to
# the set_rlimits manual page.
@audio /usr/bin/jackd nice=-1 rtprio=99 memlock=100000
@audio /usr/bin/qjackctl nice=-1 rtprio=99 memlock=100000
@audio /usr/bin/ardour nice=-1 rtprio=88 memlock=400000
#@audio /
@audio /usr/bin/fluidsynth nice=-1 rtprio=87 memlock=100000
@audio /usr/bin/hydrogen nice=-1 rtprio=86 memlock=100000
@audio /usr/bin/rosegarden nice=-1 rtprio=85 memlock=100000
@audio /usr/bin/vkeydb nice=-1 rtprio=84 memlock=100000
@audio /usr/bin/qsynth nice=-1 rtprio=83 memlock=100000
#audio /usr/bin/jackd nice=-1 rtprio=82 memlock=100000

chgrp --help