[sdiy] Attempting the impossible?? Detuning waveforms?

[Bob Weigel]

Jeff,

    The waveforms on this type of keyboard are all from one common 
oscillator.  A fellow is looking for the calibration proceedure for the 
synth so I can post it btw.  I need to see how he's doing on that.  But 
anyway unless you use a bbd or like that... you definitely won't be 
doing any detuning of the waveforms from each other.  These oscillator 
setups are common because...once you've gone to the work of producing a 
sawtooth for instance, it's quite simple to turn that into a pulse of 
varying width or a square wave.   (Ideally a circuit which buffers the 
current average maximum/minimum height of the saw waveform and triggers 
the pulse start off the rapid transistion and continues it high until a 
voltage proportioned off those values and the pulse control voltage 
(whether set by a knob or pwm source or both). 
  The cat can be quite furry btw. :-) The two oscillator version has a 
lot of fm routings and so on.  Phenominal mono/duo synth.  -Bob

Jeff Farr wrote:

>Ok, I've got myself a kitten here (not the furry kind).  It has only
>one osc, But each waveform has a volume slider before being sent to
>the filter.  It's also got a sub osc, and a sub-sub osc.  I've already
>added the Op-Amp circuits to patch out the inputs to the filter and
>it's modulation sources, and added an individual out for each waveform
>(and sub).  I'm currently working on adding a VCLag to turn the
>normally square subs into triangles and other funky shapes, I prefer
>the more suble harmonics of a tri for subs and the sub-sub makes a
>cool 'harmonic' audio freq LFO.  Now, what would be MEGA cool is being
>able to detune each waveform slightly for a thicker string sound. 
>Even better to detune the sub-sub as a LFO.  Is this even possible?
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