Archive of the former Yahoo!Groups mailing list: MOTM

I'm not familiar with the JP-80XX, but based on your description, there are
extremely simple circuits for doing this kind of thing. They are sometimes
called "sawtooth phase animators" or "multipliers."

Digisound had one called the "Waveform Multiplier." It was built around only
two chips (LM324, LM1458). It's kind of a 'sleight of hand' method of
feeding a sawtooth through it and then using pulses from detuned LFOs to
make rapid amplitude jumps and drops in the sawtooth, which simulates the
sound of seven (original + 6 LFOs) detuned saws.

I've wanted to make one of these for a long time, but I don't seem to have
time for anything these days <g>. The way that Digisound designed the thing,
it had two PCBs, and you could bang out many 'expander boards' to beef the
thing up.

I think this is probably more of what you're trying to get at than methods
of actually using a whole bank of VCOs.

Mr. T


-----Original Message-----

How do you go about creating a Super Saw(tooth) wave
as found on the Roland JP-8000/JP-8080 on the MOTM (or
any analog modular for that matter)? This appears to
be 7 detuned sawtooth waves. How are these 7 related?
Do I need to use 7 VCOs to achieve this? Is Roland
using a static wave to do this or is the relationship
between the indiviual sawtooth waves varying over
time?