This thread rules! I had no idea you could drop tape straight into the sampler, that really simplifies things for me. And the time-stretching video was so cool I ran right over and tried it out - that sound was something I really miss from my old SP202.
I’ve been getting really deep on Finger lately. After not really bonding with the drum side of the OP-1, I gave up on using it for my main drums (Patterning just works better for my brain). But now I’ve got Finger filled with cool percussion patterns that I can use to add rhythmic complexity, and turning the white knob in realtime I can get some pseudo-Euclidian patterns happening.
On the melodic side, I’m digging Finger over Pattern because you can jump around between a bunch of variations on the fly, and some googling revealed you can go to shift+tempo and use the master tune to transpose the patterns - a little kludgy, but sometimes you get happy chromatic accidents! Now that I’ve replaced all the silly techno patterns, I’m definitely going to exploring sequencing other gear with it.
As far as warming the sound up, besides EQ/drive (usually UAD plugins) and Punch or Nitro, I run the OP-1 through a Strymon El Capistan and Flint. The tonal quality of those delays and verbs are so much warmer than the onboard ones, and that frees up the FX for sound design duties.