Just add an option -q:
aplay -q ~/.zsh/sounds/done.wav
There is no need to redirect stdout to / dev / null.
Another note: aplayactall sends messages to / dev / stderr (fd 2). You can also invalidate the output by sending it to / dev / null:
aplay ~/.zsh/sounds/done.wav 2>/dev/null
You can see more options with aplay --help. This line is about -q:
-q, --quiet quiet mode
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