What are other alternatives for the P.M.'s Primary Oscillator?
Oops! Didn't realize I'd made this rack public. LOL Honestly, you could use any other oscillator you'd like that would fit within the space. I don't remember what the HP is on the Primary Oscillator. A Befaco Even VCO would be a good fit and free up an additional 8HP. I was trying to find a way to recreate the Subharmonicon since it doesn't look like we'll ever see a production version.
Come to think of it, if you switched to the Even VCOs, that would give you enough space to use a AJH Synth MiniMod Transitor Ladder Filter, which I'm sure would be closer to the sound than you'd get with the Dynamic Impulse Filter.