Here’s a bit of DX7IID bass that I’ve been having fun working on. Algorithm 22 (op 2 modulating 1, op 6 modulating 3,4 &5, with op 1,3,4,5 audible. feedback mostly around 4 or 5, coarse frequency on 1-6 starting at at freq. 0,2,1,2,1,0 , unison on. This gives a not very punchy, industrial drone type sound to it.