I like your description. Inverting a DC level makes sense. Then you have to have the inverted notch voltage drive your IN-13 to the max at the center frequency of the notch filter. I suppose I was thinking too much about the frequency bandwidth of the bandpass. 18 somewhat narrow notches for the 18 audio channels up to 15KHz is probably a decent approximation for the audio range of frequencies. The video looks great !!
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