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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
If you are downloading a big file (or even a small one) and the connection breaks or times out, use this command in order to RESUME the download where it failed, instead of having to start downloading from the beginning. This is a real win for downloading debian ISO images over a buggy DSL modem.
Take the partially downloaded file and cat it into the STDIN of curl, as shown. Then use the "-C -" option followed by the URL of the file you were originally downloading.