[sdiy] Saw vs Triangle Sync

[David G. Dixon]

> ok from the Digisound 80-2 VCO docs --
> 
> http://www.synthfool.com/docs/Digisound/Digisound_manuals/80_2.pdf
> 
> "soft sync by negative pulses to pin 9 causes the triangle upper peak
> to reverse direction prematurely with the result that the oscillation
> period is an integral multiple of the pulse period. if this input it
> not used blah..."
> 
> "pin 6 is used for hard sync and r24, d1, and c9 allow sync from
> rising edges while r25, d2, and c10 allow sync from falling edges. a
> positive sync pulse will cause the triangle wave to reverse direction
> only during the rising portion of the triangle, whereas a negative
> sync pulse will cause direction reversal only during the falling
> portion."
> 
> sounds like it's worth getting hold of a 3340 to play with this stuff...

That's exactly what my Tricore sync already does.  Yes, you can sync it with
both rising and falling edges (which make positive and negative pulses
through an RC differentiator, respectively) and one will sync the tri on the
way up, the other on the way down.

So, is the "hard sync" it mentions something else?  I.e., a Sawcore-type
comparator-based reset network driving by the sync pulses?