Keep this in mind when making sensitivity adjustments.  Hitting pads and cymbals can cause excessive vibrations through the crossbars to other pads and cymbals.  Following this procedure is the best way to get you up and running quickly.  Repeat these steps for each pad and cymbal, starting with the cymbals.  First get into rockband's freestyle mode so you can monitor whats going on.  Start with the left crash cymbal for example.  Adjust the sensitivity so it responds nicely a normal hit and you see the explosion for a hard hit.  With repeated strong hits on that one cymbal,  turn down the sensitivity for other pads and cymbals that you see triggering.  Repeat this for all your pads and cymbals.