I was checking out the oscillators ranges and I found with the oscillators set to the highest octave and the transpose fully up, the pitch stops tracking at the last octave C, so the top octave of keys play the same ear splitting frequency.
At the other end is where things get interesting, so transpose all the way down and oscillators set to their lowest octave, the digital oscillator tracks all the way down, oscillator 2 stops tracking one octave up from the lowest C on the keyboard and just plays that for any keys lower. Oscillator 1 is where things get weird it also stops tracking one octave up from the lowest C on the keyboard, but unlike oscillator 2 any keys lower than this produce an F five octaves up
Why the difference?