[sdiy] YuSynth vco tracking

[David G. Dixon]

I was just reading some web forum entries which led me to the YuSynth VCO
page.  According to the instructions for tracking adjustment, one is to set
the pitch at 55Hz at CV = 0V, then adjust T2 (the CV summer gain trim) until
the pitch is 110Hz at CV = 1V.  OK.  Then, it says to repeat this procedure
all the way up to CV = 6 or 7V (presumably from 0V every time).

What does this achieve?  Why would one make six or seven adjustments to the
same trimmer?  Unless the overall tracking is perfect, won't this only
ensure optimum tracking at the last octave adjusted?  In other words, if one
has to make changes to the trimmer after perfecting the first (one octave)
adjustment, then won't that first octave be off?  Is this procedure designed
to give the best "average" tracking?

I don't get it.