Gave this a shot also...in this case, it assumes an external sequencer is in use as well as a separate drum machine:
ModularGrid Rack
So, what this got turned into is a dedicated synth. The left side is your modulation, right is the voice.

So, this starts with the Arturia P/S since we're dealing with a Rackbrute if the size is any indication. Then a Batumi + Poti gives you four LFOs, a Zadar + Nin with four envelopes, and between those is a dual After Later VCA (Veils topology) and a Frap 321, with those two being useful for altering your "normal" mod sources into other signals.

Next up, there's a Doepfer A-118-2 for sample and hold, noise, and random signals. This gets followed by...count 'em...FOUR VCOs. Two Klavis Twin Waves mkii modules give you wavetable-based sound generation, plus they come with quantizers on the inputs. These sum down through a Codex Modulex Veils clone and then feed into G-Storm's clone of the Korg Delta filters...lowpass and bandpass, using SSM-style circuitry, giving things a nice, retro feel. This is also the same VCF used in the Korg Polysix and Poly-61. The little sliver next to that is a pair of LPGs, which can also be switched into VCA modes, and then it all feeds into a Frequency Central Stasis Leak for stereo tap-tempo delays, reverb, and chorus. And at the right end, an Erica PICO Output handles your stereo output and headphone levels.

Now, if this isn't an Arturia cab after all, then remove the Arturia P/S and put a Bastl Ciao! at the right end. This will then let you mix a second set of signals over the main feed, which alters your ability to use the LPGs, making them more capable as percussives (via the A-118-2's noise output) panned left and right, plus it gives you balanced 1/4" outputs and, yep, it's got a headphone preamp too. Also, pull the current LPG and PICO Out, then swap in a Make Noise LxD. Plus, this swap would allow you to use the top section of the LxD as a VCA and then this passes on through to the lower section which can function as the LPG itself. Loads of possible swaps...

Pair this up with a Beatstep Pro, and you'll have a potent two-voice (yep...doable!) paraphonic, or stereo gated synth. Just remember to have some inline patching widgets handy, as the build is way too small for mults.