https://www.modulargrid.net/e/takaab-vlh-vco-s-little-helper

Effin' brilliant. In just 2 hp, you get a one and/or two octave suboscillator, four-quadrant modulator, a noise source, and thruput outs for your original oscillator signals. Magic 8-Ball says this could get popular for adding subbass with a minimum of space commitment!