[SOLVED] 9.3.7: BASH script that runs after moOde startup completes

[Nutul]

Before posting, I indeed enabled it

Needless to say, you rebooted, and checked it, right?
Be aware, that MPD has to know the file; the file itself has to be part of your library; so that a LIBRARY UPDATE needs to be done, for this to work.
One more thing: all the devices in the audio chain must be working, so that if your amp, for instance, takes longer to be ready to play than the Pi needs to achieve startup-script-run level, of course you won't hear anything...

Just clues, as I do not know your setup, that is.