Suboctave generator - 4013?

[DCMagnuson at aol.com]

Hi List,

I'm designing an outboard second voice for an SH-101, and I'm fooing around 
with VCO designs.  I want to add the suboctaves to the new VCO, like there 
are on the original VCO.

The SH-101 uses a 4013 to derive it's suboctaves.  The 4013 is driven from 
the Saw wave, and creates pulse waves 1 and 2 octaves down.  By mixing the 
two they also create a 2 octave down pulse w/ ~25% duty cycle.

Is this a good method of creating sub octaves, or is there a better circuit 
to use?  I like the extremely low parts count of the 101's design, but I 
don't know if it's a "good" method, or just a "cheap" method that will be 
compromised in quality.

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

Thanks in advance
Dave Magnuson