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Completing the model #2

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jpcima opened this issue Jul 15, 2019 · 3 comments

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jpcima commented Jul 15, 2019 •

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I've quickly checked the model against Solina schematics, identified major lacking elements.
(answering also @farvardin on completeness of implementation)

In the original, the 4' and 8' sections are known as violin and viola respectively.

missing: brass section (trumpet/horn)
It's needed to identify what does the formant circuit folllowing the oscillator.
It has a set of switches which seem to affect a characteristic of a filter.
missing: bass section
It's cello and contrabass, and it has a more complex circuitry, of which I'm not fully sure how it fits in the model.
It's made from various parts: low-tone selection, clipper, trigger suppression, bass sustain, and low-pass filter

Owner Author

jpcima commented Jul 16, 2019

Some ltspice sims of formant filters, having switch in horn or trumpet position.

Peak approximately at 1.445 kHz (horn), and 4.445 kHz (trumpet)

jpcima mentioned this issue

Strange envelope behaviour #7

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Owner Author

jpcima commented Aug 8, 2019

Attempt at the formant filter in the brass branch

Owner Author

jpcima commented Dec 31, 2019

Note to self:

The service manual of ARP Omni has a description of circuits in plain english !
Including an explanation of bass parts.

http://www.synthfool.com/docs/Arp/ArpOmni/ARP_Omni_2480_service_manual.pdf

bobobo199733 mentioned this issue

string-machine bobobo199733/issues-metrics-tool-repo#31

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