I currently don't have any tips or tricks, but I'm hoping this thread will bring up some cutting edge piezo action.
I'm building an external piezo attachment for a friends CBG. It works pretty good, but you can really hear the sliding on the strings and other various noises. No feedback (which is great!). Any suggestions for reducing those noises? I was thinking filling it with silicone. Right now I have a hot glue beed holding it to the wood face that touches the instrument.