ARP Odyssey

• Switchable between sawtooth, square, and pulse waveforms with oscillator sync, a "ring modulator", and pink or white noise. (As with the Korg MS-20, the "ring modulator" is actually a logical exclusive-OR between the two VCOs' pulse waves.[5])

• Pulse-width can be modulated manually or with the LFO or the ADSR envelope generator. There is a (static) high-pass filter, as well as a voltage controlled low-pass self-oscillating filter.
• The filter can be controlled by either of the two envelope generators, an ADSR (attack, decay, sustain, release) and a simple AR (attack, release) and modulated by the LFO, sample-and-hold, the keyboard, or a separate CV (pedal) input on the back panel.
• The Sample/Hold input mixer can be used to route the output of the VCOs to the FM input of VCO 2 and the VCF, enabling audio frequency FM.

ARP Odyssey Mark I

ARP Odyssey Mk1 - black/gold version

ARP Odysseys produced between 1972[6] and 1975, referred to as Mk I, were white-faced Odysseys that used a 2-pole voltage-controlled filter, which were similar to Oberheim SEM modules. Some late models used a black and gold color scheme and include CV/gate jacks like the later Mk II's. These earlier units contained a greater number of internal adjustments and were slightly more difficult to calibrate.

ARP Odyssey Mark II

Odyssey Mk II's were produced between 1975 and 1978. They are largely similar to Mk I's; the main differences are the use of the black and gold color scheme and the inclusion of CV/gate in all models. These models also use a four-pole VCF, which were similar in design to Moog's four-pole filter. Subsequent models, however, use a different four-pole low-pass filter designed by ARP, the 4075 filter. A later filter with a similar design, the 4072, was used in the 2600, Omni, Axxe, Solus, and other ARP instruments.

Odyssey Mk III was introduced in 1978, with a redesigned chassis and orange-on-black color scheme consistent with other contemporary ARP instruments. The Mk III featured ARP's new four-pole "4075" filter, and have an unbalanced XLR output in addition to unbalanced 1/4" outputs. The rotary knob-controlled pitch bend featured on the Mk I and Mk II models was replaced by proportional pitch control (PPC), which utilized 3 pressure-sensitive buttons to control bend up, bend down, and vibrato. ARP included PPC on other instruments, and also offered a kit to add PPC to earlier Odyssey synthesizers.

Production of the Odyssey Mk III ceased when ARP Instruments declared bankruptcy in 1981.[1]

ARP Odyssey reissued by Korg[9] in 2015

The ARP Odyssey was reissued by Korg in 2015. 86% of the size of the ARP's original Odyssey with a "slim keys" keyboard, the analog signal path of Korg's reissue is similar to the original, with several updates like MIDI input and USB MIDI connectivity, a separate headphone output and balanced XLR output, and a "drive" switch to add distortion to the voltage-controlled amplifier. Korg released Mark I and Mark II color schemes as limited editions, with the Mark III color scheme as the standard model. All three versions included the three filter circuits from the original Odyssey models, with the ability to switch between them. All models also featured the ability to switch between two portamento behaviors from the original models.[3]

A Korg ARP Odyssey module

Korg later released an ARP Odyssey Module, consisting of the synthesizer and controls without the keyboard. Korg's ARP Odyssey Module features minor MIDI implementation improvements.

A limited edition, full-size reproduction of the original ARP Odyssey was released by Korg in all three classic color schemes as the ARP Odyssey FS.

In August 2019, Behringer released its own version of the Odyssey. Utilizing the orange-on-black color scheme of ARP's Odyssey Mark III, the Behringer Odyssey features a full-size 37-key keyboard and all three versions of the filter from the original ARP Odyssey models. Additional features not found on the original include MIDI, digital effects, a 32-step sequencer, and arpeggiator.[10]