I played this passage of notes on the Roland MKS-80 after spending a couple of days programming sounds. Listening back I wanted to hear more bass, so I looked around for a good subharmonic generator plugin, but didn’t find anything and decided to just add it to another layer, drop the pitch and then run it through a low pass filter. After some customized chorus settings, delay, and reverb, this is what I ended up with.
Polyphonic Synth Passage with Subharmonics