The scaled-down version of the Arp 2600 ! the famous Arp Odyssey appeared in 1972.
Some free VSTi try to recreate the analog sound of the Arp Odyssey, with its funky modulations.
Here’s a selection of 4 freeware plugins.

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1. ODSay VST by ElektroStudio

Free download and infos : http://www.elektrostudio.ovh.org/index.php?go=odsay

ARP ODYSSEY ARP ODYSSEY - Sample based synth from 1972. We have used Analog Based Hardware Preamps, EQs, Filters, Analog Saturation to spice up the Odyssey. Great vst free. This synthesizer is excellent for Electronic screaming leads and dirty Basses. 60 Instruments Size: 850 MB (Instant Download). Multi-Sampled. ADSR, Glid. ODsay is an ARP Odissey emulation. This instrument is inspired by the Arp Odyssey. Duophonic synth with 2 sync VCO (6 waveforms), 1 noise generator, Sample and Hold, 1 sine or square wave LFO, 2 filters (LP and HP), 1 VCA and 2 envelopes (1 ADSR and 1 AR), portamento and so on. Here’s a compilation of all the articles about free VST plugins that try to emulate the most famous synths, plus links to the freeware plugins that are the only one to recreate a kind of machine (they didn’t get an article). Below is a list of best free VST emulations. This vintage synth collection is free and comes with 5 emulated VST plugin instruments that include a theremin, Sequential Circuits Prophet 5, virtual analog/subtractive, Arp Odyssey Mk.II, and Moog Minimoog Model D. For more information and to download, click HERE. FREE VST INSTRUMENT PLUGINS. The one and only WAVESTATION and ARP’s famous ARP ODYSSEY were both groundbreaking instruments that inspired artists for years to come. The KORG Collection is truly a record of KORG’s history. It is the greatest showcase of the legendary sounds that have been used in countless songs across the 70s, 80s, 90s, and 2000s. This VSTi plugin is a recreation of the famous ARP Odyssey. It has exactly the same interface and controls as the original, and has no extra frills. But who needs extra frills with the Arp odyssey? One of the most versatile and clever hard wired synthesizers ever needs no frills!

The guys from Elektrostudio did it again!
The VST is souding good. It also adds a chorus and a delay that are not present in the hardware model.

here’s a bank of 128 presets for ODsay VST : download now !! Chris bank for ODsay

sample & hold pad
https://blog.wavosaur.com/wp-content/uploads/2014/10/odsay-shpad.mp3

lately bass (+chorus)
https://blog.wavosaur.com/wp-content/uploads/2014/10/odsay-latelybass+chorus.mp3

Best Free Arp Odyssey Vst Download

hard sync
https://blog.wavosaur.com/wp-content/uploads/2014/10/odsay-hardsync.mp3

more stab house
https://blog.wavosaur.com/wp-content/uploads/2014/10/odsay-stabulator.mp3

who is Elvis
https://blog.wavosaur.com/wp-content/uploads/2014/10/odsay-thisizmotherfuker.mp3

sequenced
https://blog.wavosaur.com/wp-content/uploads/2014/10/odsay-sequenced.mp3

ferox bass
https://blog.wavosaur.com/wp-content/uploads/2014/10/odsay-feroxbass.mp3
There are some minor problems or bug (but nothing that prevent from using it) i discovered while making presets for this :
– glide parameter is not saved per preset.
– when using the AR on VCA, the PWM modulation stop when releasing the key (it doesn’t happen with ADSR)
– LFO tempo sync on/off state is not saved per preset.
– and other bugs

Best Free Arp Odyssey Vst Plugin

but it’s the best freeware VST synth if you want an emulation of the Arp Odyssey.

2. Odyssey VST by SynthSchool

Arp Odyssey Synth

Arp Odyssey Free VST

Download for free : http://www.synthschool.com/free-plug-ins/index.html

Created with SynthMaker. For Windows 32 bit.
Unlike the others (and his hardware model) this one is polyphonic.
It was created to be an educational tool for those who wants to learn sound synthesis.
It sounds good, and even if the readme file explains that you should make your own preset instead of using existing ones, here’s 20 presets for SynthSchool Odyssey free ! => download 20 presets

Free Arp Odyssey Vst

3. OddyFree VST by Chris Roberson

Korg Arp Odyssey Vst

Free dl : http://web.archive.org/web/20131227220621/http://robersonaudio.tk/oddy-free/

Created with Synthedit. It works for Windows and is 32 bit.
modulations are not as efficient as the ODsay VST, the filter fm doesn’t really work.

4. OddSE VST by EFM

oddSE VST

info : archive & download

Created with SynthEdit. Windows 32 bit.
unlike the other, the osc2 can’t be modulated by the S&H mixer (but by the LFO square).