Weston Audio "Pro 2021" Sequential Circuits Pro-One Clone

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Demos previouslpy posted here, here, and here.

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WESTON PRO2021 Monophonic Synthesizer - SC Pro One Clone

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"This is a faithful recreation of the classic Pro One analog synthesizer circuit though with some serious construction upgrades. This keyboard is simply a tank of an instrument. Even the pitch and mod wheels are made of solid anodized aluminum.
It's loaded with the popular MTG TURBO CPU upgrade that allows 5-pin midi in, out & thru.
The oscillators use the famous Curtis CEM3340 rev G chips. It's as true to the Pro One circuit as it gets - but of course with modern parts which grants improved stability.
The keybed is a 37 key FATAR TP/9S (semi-weighted) with no aftertouch strip.
The chassis is powder coated aluminum with machine milled cherry wood end cheeks that I had treated with tung oil and finished with a bee-wax based wood polish."

THRU-ZERO OSCILLATOR | Weston Precision Audio - TZ0 Thru-Zero VCO

video upload by DANIELE

"The Weston Precision Audio TZ0 is a triangle-core oscillator which is capable of thru-zero linear FM and a few other nice things I'm going to show you in this video!"

Note Weston Precision Audio also makes an SCI Pro One clone.

via Weston Precision Audio

"TZ0 Thru-Zero VCO

TZ0 is a DIY-friendly analog Voltage Controlled Oscillator module in Eurorack format. TZ0 is a triangle-core VCO which is capable of thru-zero linear FM. This VCO has been engineered for extremely good 1 V/oct response over a large tuning range and great thermal stability.

Features:
+Thru-Zero Linear Frequency Modulation.
+5 wave shapes: Sine, Triangle, Sawtooth, Square, & Pulse.
+Extremely good tuning linearity (<+/-5cents over 10 octaves).
+Built-in high frequency compensation.
+Hard Sync input (reset type).
+Built in VCA for modulating Linear FM signal with an envelope.
+Robust old-school design with mostly through hole components, large copper traces, and easily obtainable replacement parts."

Weston - PRO2021 Sequential Circuits Pro-One Clone

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via NOISEBUG Reverb

You can find demos here.

"This Sequential Circuits Pro-One clone sounds incredible and has the same feel as the Pro-One did. The pure analog circuitry give the synth its phat and warm sound.

PRO2021
PRO2021 is a sonically true-to-form replica of the classic Pro-One monosynth that adds to and improves on the original by using a top-quality semi weighted keybed, rugged formed aluminum chassis, machined aluminum pitch and bender assemblies, and cherry wood ends."

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Weston Sequential Circuits Pro-One Clone - quick and dirty test

Published on Apr 9, 2019 Matt Sands

"Sam recently went to New York City for a conference and spent the majority of his time in record stores instead. He came home with some killer vinyl finds, and we couldn't wait to do a Record Run video to show them so he went solo for this video. Show him some love in the comments and let him know how he did on his haul!"

See this post for additional demos and details.

Weston PRO2021 (SCI Pro-One Clone)

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Published on Feb 9, 2019 pdxfunk

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"This is the 2nd prototype (a verification final build) I built while developing a DIY kit of a full fledged clone of the classic Sequential Circuits Pro-One synthesizer.

This unit contains the final versions of all the components and PBCs and is 100% ready to rock. Make no mistake this machine sounds EXACTLY like a vintage Pro-One. But, it's even better because it's built more solidly and reliably! Search YouTube for PRO2021 and I have a video up comparing the sounds with a real vintage Pro-One.

This particular unit, being a prototype has one little idiosyncracy, in that there were 2 misprints on the laser etching. One is the "Seq1/Seq2" switch originally says "Seq2/Seq2" and I have put a small black "1" sticker over it (see detail pic). The other is that the CV IN is labeled CV OUT and I have similarly put a little sticker of it (see detail pic). That's it for weirdness. It's 100% electrically good to go and sounds and looks amazing. Think of those little panel quirks as some uniqueness to make this a true treasure to only gain in value when this synth gets famous! Haha! :D

The PRO2021 has all the features of the original Pro-One, plus:
-Anodized and laser etch formed aluminum enclosure
-Hand-finished solid cherry wood end cheeks
-Custom Weston CNC machined aluminum precision pitch bender and modulation wheels (WAY better than the stock Pro-One wheels)
-Fatar semi weighted 37 key keybed (WAY better than the stock Pro-One keyboard. This is what is in the Moog Sub 37, etc...)
-MTG "TurboCPU" processor (upgrades sequencer function, enables MIDI, etc..)
-MIDI In/Out/Through
-LFO rate AND Gate LEDs
-VCOs powered by genuine Curtis CEM3340 Rev G chips
-VCF and Envelopes powered by Alfa clones of CEM chips

This machine is basically a vintage Pro-One but built like a real, professional instrument, with none of the cheesy money-saving stuff on the original (no disrespect, but if you've played a vintage Pro-One, you know what I'm talking about.)"

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