Suboctave generator - 4013?

[Scott Gravenhorst]

"Steve Ridley" <spr at spridley.freeserve.co.uk> wrote:
>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.

Yes, buzzy is how I would describe it.  But your later comments about 
sine wave bass are interesting.  Perhaps a wave shaper from square
to sine?  I don't know how much work that is, but if it's driven 
from a VCO then there ought to be a CV available.  Why not a VC-SVF?
this could probably do a fair enough job of wave shaping to something
close enough to a sine ??  I mean a separate VCF just for the suboctave.
and the CV would help keep the amplitude about the same across cutoff
changes.  I image there are alot of other useful waveshapes it could 
make...  It might be possible to do it with an even simpler VCF. ??

>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.
>
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>Steve Ridley
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-- Scott Gravenhorst : LegoManiac / Lego Trains / RIS 1.5
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