Reset PRAM restart or turn it off and on?

Hi,
To reset the PRAM, I typically just restart the computer while holding the "Option Command + PR" keys. Never seems to solve whatever problem I'm having - but all works well.
Am I doing this right?? I just read you need to shut down (meaning turning the MacBook Pro off?), and start up the machine while holding said keys for 3 chimes.
Will a restart while holding the keys do it properly, or must I shut the computer OFF first, then turn it back on?
Maybe I've been doing it wrong ??
Thanks,
Larry

Thank you, Peter,
You say 3 chimes, the apple link says 2 chimes whichever . . . but more importantly, I guess I should be turning the computer OFF, NOT just restarting. Thanks,

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