Weston Precision Audio PRO2021 MKII is a feature-rich DIY clone of the Sequential Professional-One analog Synthesizer.
With the Professional-1, Behringer gives a really genuine, great-sounding clone/duplicate of the Sequential Professional-One in its portfolio for a low worth.
As a substitute, there was the Weston Precision Audio PRO2021, additionally a clone of this Dave Smith basic with a keyboard and DIY. This clone is now coming into its second spherical. At Knobcon 2025, West Precision showcased the PRO2021 MKII, a brand new model of the Professional-1 clone.
Weston Precision Audio PRO2021 MKII
PRO2021 MKII stays an all-analog clone/duplicate of the Sequential Professional-One Synthesizer from 1981.
Like the unique Professional-One, it options two oscillators, a lowpass filter, two envelopes, LFO, sequencer, and extra. Not like the classic synth, the PRO2021 MKI and MKII have MIDI help.
The enhancements on the brand new MKII model primarily concern the {hardware}—bye-bye to plastic case, low-cost knobs, buttons, and keyboards.
In accordance with West Precision Audio, they fully remade the MKII {hardware} with a brand new steel panel, higher potentiometers with steel shafts, and high-quality shafts.
Plus, there are improved switches and a greater keyboard with aftertouch for controlling the filter and pitch. There are additionally enhancements on the within.
The PRO2021 MKII shall be simpler to assemble, and there shall be no inside cabling vital. Additionally, they improved the circuitry so it produces much less noise. The structure stays the identical however gives a brand new part for the aftertouch routing.
Listed here are two demos of the earlier PRO2021 MKI.
First Impression
Good to see that the DIY mission is being continued and can quickly be launched in a brand new model
Weston Precision Audio didn’t share particulars in regards to the PRO2021 MKII worth and launch.
Extra info right here: Weston Precision Audio
DIY Information
{Hardware} Synthesizer Information