Supporting member, Digituria wrote in to let us know of a blog post they put up on the history of analog synthesizers. They are also working on a new soft synth named MATRIX DUDE of all things. No affiliation with me or the site.

OSCILLATORS
Two wavetable analog emulation that reproduce the same harmonics as the classical Model-D square and triangle, while keeping the sharpness of a digital sawtooth. The inverse sawtooth and note-sync allows you to combine both oscillators to recreate a PWM.
FILTER
The synth includes a faithful recreation of the 4 poles 24db "ladder" filter to carve the sound. In addition to the cutoff and resonance there's an extra "spacing" parameter to move the cutoff frequency between the stereo channels.
They had better start with the history of the pipe organ because that is the first analog synthesizer.
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