Patch: three A-110s are mixed and then split into two signals: one is sent into an A-108 (24 dB lowpass output used) and then mixed with the other one in a polarizig mixer (here: A-138c). Original and filtered signal get opposite “polarizations” in the mixer (i.e. one signal is inverted).

Manual change of filter frequency - three times from low to high and back: without resonance, resonance at 50%, full resonance.

With increasing resonance, the inversion of the filtered signal will be reduced drastically, so in the end, you will have a simple mix of original and lowpass filtered signal.

Andreas