piezo calibration

[jpmplayer888]

what is the deal with the 3 little screw looking things on the back of the petrucci, i know they are for calibrating the piezo, but do you just kinda fiddle around with it till you like the sound, or is there some trick to it or like a preset?

 

[roburado]

This thread has procedure to get you started. Read jongitarz' posts, especially. how to adjust your piezo settings