piezo transducers !! Ok not realy an effect, but when I hear an acoustic guitar part that's been tracked in the studio (live I give a little lee-way to) by guitarist's that can obviously afford better systems, and I hear this weak sounding Piezo crap come through the speakers it truly makes me wince and cringe. Now I know not everyone can sound like A Windham Hill artist on acoustic, but I just can't accept it when I hear an otherwise good guitar part destroyed by the Piezo Devil. That Sh*t should be banned.