Wow, how helpful....
Just above your can, there is the little black beeper. It has a couple wires going into the top of it. You can just pull the plug off, but I dont recommend that. Just put a small tissue wadded up or cover the hole in the bottom with tape or something. You want to be able to just hear the thing, not make it go quiet. If you silence it for good, you could have an accident. Imagine grabbing a fist full when you think your ready for it. Then having your body pressed up against the throttle keeping it pinned. Bad things can happen really fast.
I just wadded some tissue up, and it quieted it down a bunch, but I can still hear it. It has saved me at least twice that i remember.
Joe