I finished it! I'm getting better at this. This is the first one where I really noticed some 7th chords, so I worked those out. Also, I had to split the strings across 5 tracks to get the stereo effect. Makes it a lot harder to work with.
One thing is I found the compressor controls for the TR-909 instrument, so I made some of the elements punchier. Wish I'd known about those sooner! I might have to go back and tweak some stuff.
I used so many tracks, it's actually starting to max out my CPU. Might be time to upgrade...