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Values will depend on the driver and the hardware specifics, so you need to refer to your driver documentation for proper interpretation of those values.
useful signals are:
pkill -SIGSTOP mpg321 #pause
pkill -SIGCONT mpg321 #resume
pkill -SIGHUP mpg321 #stop
pkill -SIGKILL mpg321 #force exit
TIP: use aliases or shortcuts to control mpg321 from the Desktop Manager
I found this in Ubuntu repos, and consider it better than timeout.