Void's probably following the Brian Eno logic for how to figure out synthesizers: install, toss operating directions out, develop own methods instead. And that's perfectly valid...the other school of thought is to pore over the docs before using, but the critique there is that what you learn is a rather "doctrinaire" set of use methods.
As for the different filters, here's a different and potentially better idea: https://www.modulargrid.net/e/nonlinearcircuits-timbre-timbre Instead of changing the filter, add this after the Gravitational Waves to alter the waveforms in ways that the dual oscillator alone can't. Whenever you do waveshaping of any sort, what happens is that the waveform gets altered in some way, which then alters the harmonic content of the original sound. This sort of circuit is in the Moonphase, but it's much more flexible to NOT have the waveshaper in another module, as you can also use them for screwing around with LFO waveforms.