[sdiy] Saw vs Triangle Sync

[David G. Dixon]

Now that I've got some Sawcore VCOs to compare with my old Tricore VCOs,
I've noticed that the biggest difference is in how the two behave under hard
sync'ing.

In a Sawcore VCO, the saw integrator is reset to ground at odd times.  This
leads to piecewise discontinuities in the derived triangle and sine waves.
This imposes a "saw-like" sound on these waves, with lots of harmonics.

In a Tricore VCO, the triangle direction changes at odd times.  This leads
to triangle and sine waves with no discontinuities, and hence, few added
harmonics.  In other words, the triangle and sine waves retain their "siney"
flavour even when sync'ed.

I have to confess that I much prefer the sync behaviour of the Tricore VCO.

Just something to consider when trying to decide which kind of VCO to
use/build/buy.  Having both kinds is probably the best option.