Wersi EX20 MIDI Expander w/ Cart

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"WERSI EX20 MIDI Expander Vintage Synthesizer Original 19" 3U + Cartridge (RARE)."

You can find demos of the Wersi EX20 in previous posts here.

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Wersi EX20 - rare 20 voice additive synthesizer with analog SSM filters

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Pics of the inside below. You can find videos of the EX20 in previous posts.

"This is the rare 20 voice rack version of the Wersi MK1. The EX20/MK1 is a VERY unique additive, digital/analog hybrid synthesizer. It's an oddly complex, weird alien machine in every manner. It's notoriously one of the most difficult synths to master due to its cryptic language, design, programming methods and function. So if you enjoy taming the more deep and daunting synthesizers: you'll be in bliss with this. Fortunately I have the programmer overlays attached to the top for (much needed and convenient) reference. Adding to its outsider nature; it is also paraphonic, as the 20 additive voices feed into a single but glorious sounding analog SSM filter. The EX20 has been internally cleaned and well cared for. It is functioning as properly as a EX20/MK1 can be, with all the original quirks and charms it was born with. Definitely one of the most unique synthesizers made. The most stable and current OS proms have been installed."

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Wersi EX20 additive synthesizer

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"Here's a rare and hard to find Wersi EX20 additive synthesizer. This is the rack mount version of Wersi's MK1 synthesizer. It's in excellent condition and is fully tested and works perfectly. Comes with the wooden outer case that can be removed for rack mounting..."

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BERLIN SCHOOL SYNTH JAM BEHRINGER Model D ARP Odyssey KORG MS 20mini GRP R24 Roland Juno 60

Published on Feb 16, 2019 VolcaRock

"BERLIN SCHOOL Live Retro Synth 70ies Jam with Behringer, Korg/ARP, Moog, Roland, Oberheim, GRP, Wersi, Arturia. I explain which synths are playing, you don`t have to guess ;-) Enjoy HYPNOTIC SEQUENCES , WARM STRINGS & MELODIC LEADS.

LEAD: Behringer Model D, Roland Juno 60 with Tubbutec 66 Mod
SEQUENCES: Korg MS 20 mini , Korg ARP Odyssey , Moog Minitaur
STRINGS/ORGAN/SWEEPS: Wersi EX 10R/EX 20, Oberheim Matrix 1000
DRUMS/PERC: Arturia Drumbrute
GRP R24 Sequencer is controlled by Elektron Octatrack (MIDI Master).

I use some Hardware FX for the synths:
DELAY: Pigtronix Echolution2 Deluxe (digital), Rockman Stereo Echo (analog) , 2x Behringer Vintage Time machine in one modded box (analog),
PHASER: Vermona PH 16, EHX Stereo Polyphase, EHX Nano Small stone
AUTO PAN: Behringer TP 300, Elektron Octatrack
REVERB: OTO BAM, 2x Lexicon MPX 100

Finally I added Oberheim Matrix1000, Arturia Microbrute and Wersi EX20 to my setup.

Hope you enjoy my latest Berlin School 70ies style Session :)"

WERSI EX10R Synthesizer Expander with 8-bit drums 1985 | HD DEMO | SAMPLE PACK

Published on Jun 13, 2016 AnalogAudio1

"(c) 2016 by AnalogAudio1

Wersi EX10R is a programmable synthesizer module / accompaniment from Germany.

It has digital and analog circuits. It has digital waveforms and sampled waveforms. Resonant VCF (lowpass filter). The modulation effects are fully analog: chorus and ensemble. It has great 8-bit drum samples! It also produces great string ensemble strings, thanks to its "ensemble" effect. Great organs (hey, it's a Wersi!) It also has a programmable accompaniment section. MIDI. Little fluorescent display. The programming is quite complicated.

----------------------------------------­----------------------------------------­---------------------

"WERSI EX10R" SAMPLE PACK

Do you like the crispy, analog drums of the Wersi EX10R? You can buy them as 'SAMPLE PACK' for 4,99 Euros. All drum sounds of the machine are included (16 bit / 44,1 kHz wav samples).

Recording was made in high quality using RME studio equipment. All original pure sound directly from the machine's output, without any treatments.

After payment through PayPal you will get the sample pack via email.

If you want to buy the sample pack, send a message to ceramic-man@gmx.de (and check your spam folder, I answer quickly)."

Update via swissdoc in the comments:

"The Wersi EX10 is the rack version of their Omega DX10 organ. They use the DMS tone generation, which is featured in devices like Condor DX100, Alpha DX300/350, Beta DX400, Gamma DX500S, Delta DX500T, Prisma DX5, Omega DX10, Stage Performer MK1, EX10R and EX20.

Only the Stage Performer MK1 and the rack version of it, the EX20 are programmable.

The EX10R can not be programmed, as in creation of a sound from scratch, it can be used to layer presets and to modify filter settings (switched cap filter or SSM 2044 in later models) or settings of the Wersivoice String-Ensemble. The drum part allows for user pattern creation.

DMS stands for Digital Multi-Sound and is in fact based on a Z8 CPU driven voice card for 2 voices, which is based on fading between additive created waveshapes. There is no sampling involved, even so the sounds are pretty "realistic".

Some presets utilize a special programming of the voicecards, one for instance cycles through the vovels A-E-I-O-U per keypress, another one play a little arpeggio. Those cannot be programmed on the Performer MK1 or the EX20, only a special computer system at Wersi could do this.

The EX10R could be equipped with reverb (DH10, DH11 or DH100) all similar, using different bit depths, sample rate and number of algorithms. Sound quality of the DH10 is quite low-fi and calculation is based on 6809 processor.

The Spectra from the CD Series later had an enhaced version of the DMS system, where much more harmonics have been available.

Wersi later developed advanced concepts for digital pianos by using transputers and data compression, called WERSI-Digitalpiano CT 1 or CG 1 based on D-Art-Klangerzeugungs-System mit ASIC-Transputer-DSP Technologie."

Wersi Sounds DAS Instrument Demo Cassette Tape

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This one in via swissdoc. It was listed on eBay Switzerland.

swissdoc created an mp3 from his copy on CD (link below):

"I have this music on CD and ripped it for information and educational pupose about how the Wersi Instruments sound. It is a demo CD for Wersi Instruments like Stage Performer MK 1 SIII, Spectra DX 700 CD, Midi-Expender EX10/EX20 and Drum Composer CX 5, music is composed and recorded by a certain Dirk Schmalenbach. On German Wikipedia you find some details.

Wersi Special 1 - Sounds"
[61.8M zip file]

Check out the inner artwork for the tape further below.

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WERSI EX20 Midi Expander SN 95502

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Wersi EX20R Rare Additive Rack Synth

Note: Auction links are affiliate links for which the site may be compensated. Wersi EX20 demo (avant garde elektronische musik)

Uploaded on Nov 6, 2011 acreil·67 videos

Video spotted in this auction

- pics and details for that one captured below.

"Download here: http://acreil.bandcamp.com/album/misc...

I don't know what's wrong with the likes/dislikes on this video. Analytics shows 24 likes and 0 dislikes, while the video currently shows 3 likes and 29 dislikes. There seems to have been a glitch at some point.

Multitracked Wersi EX20 with Ibanez SDR-1000 reverb. This synth is capable of some highly unusual sounds when (in)correctly programmed, so I thought I'd showcase that side of it. It's sort of a half tribute and half parody of 70s computer music (i.e. Jean-Claude Risset, John Chowning, etc.). I find that sort of music tends to be sometimes brilliant and sometimes ponderously arbitrary (at least from the listener's perspective), so I tried to get a little of each in there.

Due to the bizarre user interface and poor/unavailable documentation, I think very few people have programmed these synths to this extent. At the time I think I only had the German user manual. I have the English manual now, but it omits much of the sound programming stuff.

Most of the interesting territory comes from doing strange things with the pitch and amplitude envelopes. Each stage of the envelope can be assigned a "module" that takes two parameters and does some function like noise modulation, increment, delay, linear or exponential rise or fall, loop, etc. It's even possible to make nested loops. These things don't necessarily behave the way you'd expect (are these undocumented features or bugs?), so it's basically a trial and error process, but the results can be very surprising. Recorded 2010?

Check the (NiCd) memory backup battery if you own one of these. They can leak and cause damage."

via this auction

"The Wersi is a very deep synth, even today, has an analog filter and uses beautiful additive synthesis, with lots of envelope modulations possible..."

Curious how deep these are. Wersi's are known for more preset auto-accompaniment type machines.  You can find some details in this previous post.

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Wersi EX-20 synthesizer Expander

YouTube via hilltree

"Some patches on the rare multitimbral wersi ex20 .
Notice the build in fx.
More at www.groenewoudnet.nl"

Wersi EX20 MIDI Expander Synth

via this auction

"After 10 years as an organ manufacturer, Wersi enters the synthesizer field with the MK1 (or EX20 module), a digital 20 note polyphonic synthesizer.

Its sounds are based on a configuration of sounds modules such as wave, pitch-envelope, amplitude envelopes and analog effects to produce fourier, waveform sample, and modular synthesis. The front panel features a 32 slider 'wavemaker' module used for each synthesis mode.

A 61 note velocity & pressure keyboard can split and provide up to 8 timbres simultaneously per side. The EX20 is a rack mount version of the MK1. Both instruments can 'see' up to 16 midi channels for multi-timbral operation, and transmits on up to 8 channels at one time."