An acquaintance of mine recorded a session a while back where, in stead of individual mics for each drum and cymbal, they had PZM mics stuck to the individual panels of the plastic isolation screen around the drumset. Apparently the PZM's, if attached to a flat surface, are supposed to treat the whole flat surface as a mic diaphragm. I want to know: How common is this? How does it work, sound-wise? I listened to the recording, but the drums were far enough back in the mix that I couldn't tell enough.