[sdiy] Adding "sync" to a Through-Zero Sinewave Oscillator design

[ulfur hansson]

hello list!

i have been working on a prototype for a through zero quadrature sinecore
oscillator over the past few weeks, and have been thinking of ways to add a
novel type of "sync" to the circuit.

I love the way traditional triangle core oscillator sync sounds, and much
prefer it to the harsher sawcore type sync.

with trianglecore sync (I hope I understand this correctly) *the waveform
changes sign at trigger points* rather than doing a hard reset to 0v, right?

since my oscillator is through zero, my idea is to implement a switch that
inverts the incoming v/8 CV everytime the "sync" input exceeds a certain
threshold.

this would (in my mind) effectively *only *change sign of the sine
waveform, emulating the triangle core sync i mentioned before.

before I start gathering components and laying out a sync prototype board,
i'd love to see if any of you think this is a ridiculous idea - and if
there is any literature out there on various methods of sync, i would love
to learn more about it beyond discharging integrator caps to ground :)

thanks so much for your insight!
all the best,
-úlfur
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