[sdiy] 60s organ sound

[Antti Pitkämäki]

>The individual footages should be roughly sinusoidal
>(assuming Vox continental - drawbars etc) so that
>mixing the waves will give the desired 'additive
>synthesis'.

>The mixture footages could be either complex waves
>(I doubt that) or a summation of some higher footage
>sinewaves, notably from fifths above the fundamental.

Actually the Vox organ has a choice of two waveforms: a sine or similar and 
"reed", which is something like a sawtooth or something. The mixture footage 
is the following pitches combined: a pitch that is 2 octaves and a fifth 
above the fundamental, a pitch that is 3 octaves above the fundamental, a 
pitch that is 3 octaves and a major third above the fundamental and a pitch 
that is 4 octaves above the fundamental. So the organ can produce all the 
harmonics of a Hammond except for two. Combo organs often have the 
possibility to use much brighter wave forms than sines, which is part of the 
psychedelic sound. It's like some twisted form of additive synthesis ;)

One more thing about combo organs: Like console Hammonds, some of them too 
have foldback, that is, if the organ should produce a pitch that is higher 
than it can produce, it simply produces it from an octave lower.

A link for combo organ information: http://www.combo-organ.com/ (hmm, kinda 
obvious :P)

Antti

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