I'm 14 and am trying to build a bandstop (notch) filter in vanilla PD for a science project. I'm trying to get it to be able to take in a CF and a changing Q, but can't seem to get my biquad math correct. I've double- and triple-checked my equations so my assumption is that I'm using the wrong ones, or in the wrong order. When I try to input the computed coefficients, no sound comes out at all. I have tried with the normalizing (dividing by A0) and without. I can't really use external libraries for this so cyclone and other such things are out of the question. Does anyone have any idea what I'm doing wrong? [Notch_fexpr.pd