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I started taking piano lessons two years ago to help with the keys thing. It's been time well spent, but I think I might have been better off if I'd just really focused on chord drills. I can play a fair amount of stuff, but it's not really moving the needle as far as improvisation goes.But I love our piano. It's definitely a different experience than the OP-1.
@eesn, The drill has been really good. I haven't gotten as much theory as I'd like, which is partially my fault (I'm not pushing for it), [...] Having my instructor sitting next to me once a week and catching the smallest bobble in my assigned work makes me more self-critical in generally a good way.
Playing the OP-1 seems more like touch typing than playing keys, I'm just saying.
I'm probably not the guy who should be answering this question because I took piano lessons when I was a child. One thing I love about the OP-1 is that I can play it with headphones at night in the dark while I'm lying on my back. This has forced me into a "touch typing" approach to playing music just as @seanfear says! I come up with different interesting stuff when I do that, and it feels like I have some new neural connections between what I imagine, what I hear, and the way my fingers move. There's no other synth I know of where I can do this.