ak, thats a great idea... i didn't realize that it was a square wave. do you mind redrawing the circuit for me the way you'd put that in there? i have no clue how to add such a thing to this circuit
btw i'm using a stereo pair of typical piano mics for the mids and highs. they sound great, down to about 100Hz... thats where this whole thing comes in, with a specially designed mic for picking up low frequencies - but which tends to pick up that thumping noise as well. even though the thumping is an inherent part of the instrument (you can experience it by placing your head right down next to the strings), people usually find this sound annoying and unnatural, so it needs to go. also, sometimes pop piano genres can utilize low frequencies way beyond what would be considered appropriate for classical music, and those last 11 notes need to be really solid in the subwoofers.