i bought one of those nice custom power crystals with the mahogany pot. it sounds nice and can really sing when i can get it to work. i conditioned the galss like the box told me to rubbing the surface one way and then again across the grain. after i work the glass it sounds good, however, if i let it sit for a day or so it seems not to work as good unless i refresh the glass. is this normal or am i just screwing things up. that is very possible! ha ha i am using the purple heart striker that came with it and it seems that the striker wants to slide on the glass and make a squeeky sound instead of the sounds it is supposed to be making. is it the glass or is it my calling skills or lack of?