Suboctave generator - 4013?

[Steve Ridley]

> Anyone use 4013-based sub octave generators in their designs?  Drawbacks?
> Limitations?

My main problem with squarewave sub-octaves is that I think they sound
horrible.  You'll get an octave below, but you're stuck the squarewave's
harmonics too, starting with a fifth above the VCO.

A square wave divider is a start, but if you add the right amount of
sawtooth
from the VCO, you'll get a sawtooth a suboctave sawtooth.  I think some
early Korg and Roland synths used this trick for octave switching on their
VCOs.  Once you've got a suboctave sawtooth, it's fairly easy to convert it
to a triangle and then a sinewave.

A sub-octave sinewave is very useful.  It can add some "bottom end" weight
without messing up everything else, and you can even add it after the VCF
so you don't lose all that deep bass at high resonance settings.




Steve Ridley