hey - thank you! That’s a really early one… I’m currently on account # 7/8 
Operator Operator 7 | Free Listening on SoundCloud
I can’t remember recording that track OTOH, but my process hasn’t changed much; yoof was right, I just set up a sequence in Endless and then record a synth+effects to tape while continually tweaking. Before I start recording I try to figure out which parameters sound good to tweak, but in general this was mostly improv and just having fun. Early on I did some bouncing to get more than 4 tape tracks, but I don’t think that’s happening in this track.
Once I’ve filled all 4 tracks I mix down to album – usually I do two mixes, and then later pick whether I prefer A or B. In my more recent stuff I pull the album A/B into Goldwave (don’t laugh!!) and mix all 4 tracks together to get some more stereo stuff happening; big thanks to whoever mentioned the Haas effect on these forums, it’s awesome and I use it all over the stuff in accounts 7/8.
The whole process usually takes about a couple hours per song (more if I’m having trouble mixing to album or if I make a mistake while tracking stuff); for a couple years I was on a good run recording a new song every week or so, but sadly work/etc got busy, alas.
I ended up with this process simply by being lazy and trying to figure out what the most fun way to use the OP-1 was, i.e how it “wanted” me to use it. I find that any sort of editing or drum work is way too hard/slow (compared to a DAW) but that it’s great for live tweaking because each synth engine has a bunch of sweet spots and they’re generally really useable across the whole range of each parameter. Ditto for the effects.
I almost never use sampler (not tweakable enough), so those are all built-in synths. To me it sounds like:
-the infrequent chord stab (on the 2 and sometimes the 4) is Digital – you can tell because I use Blue to add some white noise, no other synth engines have a noise source in them (IIRC… sadly I’ve been away from OP-1 for the past couple years). Sounds like I have some Delay on there.
-the acid-y lead is definitely Dr.Wave; you can get those squelchy sounds by tweaking White to get a sort of sync effect (the waveform repeats multiple times). I think I was mostly just changing the waveform shape via Blue. Sounds like Delay on this one too.
-the bass chords sound like Cluster to me, with Tremolo to give the volume envelope some movement. Cluster doesn’t have as much range as some of the other synth engines, but I think it works well for bass. I think this has Delay too… early on I didn’t know how to use most of the effects very well so I stuck with the simple ones
-the hyperactive arp part is (I think) String through Spring. I really like this combination, Spring smooths out the noise bursts, and String is good for arps because each hit is random (since it’s noise-based) thus it doesn’t get as repetitive as other synth engines, it sounds a lot more “alive”.
Anyway, thanks so much! I really want to revisit some of these sketches and build them into more complete tracks (with some drums/etc. and fixing the mix), but some of them work okay on their own.