The OP-1 is an intuitive little synth. While you can get up and running very quickly, knowing all the ins and outs can take some time when you have no reference to resort to. Today, Teenage Engineering published 5 instructional videos for the OP-1 that go over the core functionality of the device.
The ‘OP-School’ videos provide a clear visual overview a la Ableton’s demonstration videos, but in typical Teenage Engineering style.
Official OP-School page