- The sharp knob: the actual shape changes as you increase the Tune knob, and is slightly different for each oscillator.
It gets square-like at the low end of the Tune knob, except for oscillators 7-8.

At about halfway up the Tune knob:

At about 3 o’clock it’s more like:

It loses a lot of stability past that point and flattens back toward triangle-hood (as if the sharp knob had been turned down).
On mine, oscs 7-8 at full CCW start off at about where 1-6 are at noon.
I never even realized this until now. Typically the tune knobs are somewhere between 9 and 3 – the range for each knob is different for each pair of oscillators, so they don’t necessarily increase from left to right.
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Total Feedback: is really hard to figure out, so I can’t even answer the question. It doesn’t sound like it’s self-FMing though.
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Vibrato depth also varies. 1-2 has a very minimal amount of vibrato – like you don’t even perceive it as vibrato – and it’s probably closer to 1Hz. Oscs 3-4 don’t have much more depth, and are maybe 1.8 Hz? 5-6 are probably 3Hz, and 7-8 have too much vibrato for my tastes and it’s probably about 4Hz.