[sdiy] 60s organ sound

[Fredrik Carlqvist]

The Roland SH-1000 is built around an 'organ core'. There is a VCO, but it
is used only to drive a binary divider chip. Different waveforms are created
by adding different outputs from the divider (square waves in different
octaves) and then filtering the result. Narrow pulses, staircase "sawtooth"
etc. 

They also have some formant LC filters for the brass sounds. The octave
switch selects where the VCO input goes into the divider.

So it is easy to get organ-like sounds from the SH-1000. If you are
interested in more details, I have the schematics. It would be fairly easy
to build a clone.


Fredrik C


-----Original Message-----
From: owner-synth-diy at dropmix.xs4all.nl
[mailto:owner-synth-diy at dropmix.xs4all.nl] On Behalf Of Gorka Garcia
Sent: Thursday, December 09, 2004 23:37
To: synth-diy at dropmix.xs4all.nl
Subject: [sdiy] 60s organ sound

Hello everyone,

I am pretty new to all this synth-diy stuff, so please correct me if I say
any nonsense.

How could I recreate, using a monophonic analog synth, the sound of those
classic combo organs from the 60s (Vox continental, Farfisas...)? What I
mean is, what sort of waveforms did they use in the oscillators? What shape
does the vibrato waveform have? which filters should be used?... 

Thanks in advance,

Gorka

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