Phaseshift / Osc Sync idea

[Per Mattsson]

I got this idea on phaseshift by using osc sync which I simply has to
bring up here.

In short: A slave osc syncs to the inverted output of the master osc's
PWM-stage. What we get (if it works and I cannot see why it shouldn't) is
two oscillators in sync where the slave is phase shifted as much as the
master osc's PWM output is shifted.

OK, but why?
By using CV on the PWM-stage we get CV-able phase shift between the
oscillators. Since there's no delay line or filter involved to do the
phase shift both oscillators should repond at the precisley the same time
to freq modulation even at audiorange modulation. Route any non-square
wave output from the oscillators to the CV-PWM input of the master osc and
you should get some sort of
waveshaping thing.

I guess this is already used somewhere but is it possible to sync on a
squarewave and not on a saw?

---Per