Greetings! We have all wrestled with what you’re going through to some degree (which tools? what form? how to decide?). It’s hard, that’s for sure, and unique to artistic pursuits (the framer doesn’t obsess over which tools he needs to build a house. It’s a hammer, nails, and a tape measure).
What you’ll hear over and over is that there’s no right answer, as this is a very personal question. Take my thoughts with a grain of salt. I’ve transitioned this year from guitar-centric post rock music to electronic music 90% composed on modular, for what it’s worth.
I think this is mostly on point and jives with my experience, with one exception: modular. The physical act of patching unlocked synthesis for me in a way that VCV/softube never could. But that likely has more to do with my own learning modalities than anything else. The point stands that there’s a software version of everything, either free, bundled with live, or very affordable. Don’t buy a Digitone to try out FM synthesis; try it in software first, then invest if you want to go deeper.
Listen, for real- if the depth of the octatrack didn’t sit well with you, avoid the ZOIA for now. It’s a wonderful, amazing device. But it’s very small and very non-screen oriented. I’m afraid it will just be frustrating. Are you after a specific kind of effect or workflow? Or just want to explore? May I suggest the eventide H9 max in its place? Bout the same price used, loaded with fun, immediate effects of astounding quality. Less customizable, more playable.
My gut tells me the OT was the right choice, then. It’s a robust non-daw composition and performance machine. But getting to the level of nirvana that you seek is going to take a while. Deep hardware requires, as you noted, a certain degree of muscle memory, just like any traditional instrument. Work with it for several hours every day without missing a day for 60 days and see how you feel after that.
I don’t own an OP-1, bear that in mind. Mostly because, this late in the game, it’d tie up a pretty significant portion of my gear budget (I thought it made sense at $900, $1300 seems wild to me). People love that thing, and perhaps rightly so. If it helps you make music, go for it. But it’s fairly deep as well, and isn’t going to instantly solve what I think is your actual dilemma here.