i just did this piece where im emulating the obscure opl2 2-op fm chip. the fm sounds are run through an analog filter and the bassdrum is from an 808. all the patterns are based on 5 versus 12. all recorded on tascam 644 cassette deck.
there is an extensive description on muffwiggler:
high res audio:
the patch (there is no way to include imgs?):