Serge Waveshaper was Re: Harmonics question

[Jeremy Brookes]

>>I recall seeing diagrams of such unlinear waveshapers. I even think
>>that we have discussed this several times. For instance do I recall
>>that the Serge waveshapers would do odd and even harmonics and that
>>the schematic is very simple indeed.
>
>I wonder if you're confusing the Serge Triple Waveshaper with the Wave
>Multiplier module. One waveshaper is a very simple circuit based around 
one
>quarter of an LM 3900 and does non-linear "Harmonic Reduction" (unlike
>anything done in music theory). It is similar to a CA 3080 tri-to-sine
>converter I believe.
>
>The Wave Multipliers do some nutty half and full wave rectification (I
>believe) and have a whole lot of chips. The sound to me is very much what 
I
>would expect from the timbre modulator circuits in the oft mentioned
>Electronotes and in Barry Klein's book. I would never attempt to build 
one,
>too complicated for a timid sole such as me. Now if some one offered some 
kits
>of these circuits...

All this talk has got me interested in a mod I started to implement to my 
MS-10 a while back. The idea was to add a sub oscillator to the VCO and 
control its level via a normalised connection on the external signal jack. 
Without anything plugged in to the external signal socket, the external 
signal level would now control the sub-osc level.

Maybe though I'd be better off putting some sort of signal shaper in there 
instead. I don't want to hack the MS-10 (no extra knobs, etc.) so I'd want 
to use a waveshaper that had fixed (or no) controls. Anyone have any 
circuits/ideas as to what a good and interesting waveshaper is?

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