http://rockband.scorehero.com/forum/viewtopic.php?t=22484
^this just reduces the amount of how far you have to press down on the pedal, so quicker kicks will be easier. For actual sensitivity, you may need to do a DIY pedal fix (drum sticky) since you can adjust how far it goes down.
You can also take 2 or 3 pennies and tape them down to where the stopper makes contact with the base of your stock, it'll do the same thing.
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