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Just to be clear what is going on, I just found that I can inspect these settings from the command line using "pmset" and it actually shows the parameter being overridden and that Yousician is doing it:

$ pmset -g
System-wide power settings:
Currently in use:
standby 0
Sleep On Power Button 1
womp 1
halfdim 1
hibernatefile /var/vm/sleepimage
powernap 1
autorestart 1
networkoversleep 0
disksleep 1
standbydelayhigh 86400
sleep 0 (sleep prevented by coreaudiod, coreaudiod, coreaudiod)
autopoweroffdelay 28800
hibernatemode 0
autopoweroff 0
ttyskeepawake 1
displaysleep 15 (display sleep prevented by Yousician)
highstandbythreshold 50
standbydelaylow 0
long long title how many chars? lets see 123 ok more? yes 60

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