ARP ODYSSEY UPGRADES & RESTORATION

   
 
       
   
       
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NEWS AND UPDATES - 01/02/2025

SECOND FILTER FOR THE ODYSSEY - It gives the upgraded ARP Odyssey (and Avatar) the sound capability of the ARP 2500. We replace your fake high pass filter with a fully functional multi-mode filter from the ARP 2500. Keep your existing filter. Integrated bypass switch.

THIRD OSCILLATOR FOR THE ODYSSEY - Take it to the 2600 level with a third VCO that produces all 4 waveforms. Modulation pots and modulation source switches 2500 style.

4035CX FILTER - CMS has come up with a much better sounding Moog ladder filter (compared to the original and competitors) for the ARP Odyssey 2!

See below for more details.

 
   

 

STANDARD UPGRADES FOR THE ARP ODYSSEY

YOU MUST SEND YOUR ODYSSEY TO CMS FOR THESE UPGRADES, SEE BELOW FOR KITS AND PARTS

(no machining of the front panel)

FILTER UPGRADE - (4075) - FOR MODELS 2811 thru 2823 - $119.00

Odyssey 2 filters have a upper frequency limit of 11khz! This frequency response upgrade is similar to the 2600 filter upgrade extending the cutoff frequency range from 11khz to 28khz. This upgrade also replaces some critical components in the signal path. Your filter sub-module is removed, tested, upgraded, re-tested and re-installed into main board "C".

 

POWER SUPPLY REBUILD - ALL MODELS - $109.00

Certain critical components in your power supply have a shelf / working life of 20 years maximum. It's probably time your power supply was rebuilt. These units are getting very old, so if you are serious about your ARP, you should get the Power Supply Rebuild.

 

AUDIO PATH UPGRADE V2.0 - ALL MODELS - 2800 thru 2823 - $145.00

This mod replaces critical signal path components in the synthesizer section of your Odyssey with audiophile grade components. Low end response is improved resulting in a more accurate wave shape. High end response is also Improved.

 

 

 
     
 

MAJOR UPGRADES FOR THE ARP ODYSSEY

"Drill Baby Drill"

These mods require and include front panel machining

 

NEW! - 2827 VOLTAGE CONTROLLED OSCILLATOR 3 - ODYSSEY 2 AND AVATAR ONLY - $549.00

We can install a third VCO and support circuitry inside your Odyssey. The controls are located in the blank section above the transpose switch. It uses the exact VCO circuitry used in the Odyssey 2, so it tracks perfectly with the existing VCOs in your system. It has 2 modulation inputs with modulation selector switches and pots. The knobs and toggle switches are ARP 2500 style for a slick look. It also produces all 4 wave-forms including triangle and sine. The sine wave has significantly less distortion than the sine wave available on the 2600. This mod takes your 2800 to the 2600 level, and then some. This is only available for the Odyssey 2 - specifically models 2810 thru 2823.

 

NEW! - 2847 MULTI-MODE FILTER UPGRADE - ALL ARP ODYSSEYS AND AVATARS - $699.00

Take your Odyssey beyond the 2600 into the 2500 realm. This mod replaces the rudimentary and useless high-pass filter in your Odyssey with a fully functional multi-mode filter with that incredible sounding resonance. It gives the upgraded ARP Odyssey (and Avatar) the sound capability of the ARP 2500. Sounds freaking awesome. We install a new ARP/CMS designed circuit based on the famous ARP 2500 multimode filter that adds 4 great sounding and useful filter responses. Expertly installed with 2500 style colored knobs, and switches.

Important! This incredible new mod from CMS lets you keep your existing low pass filter. This is because this additional filter, located after your existing filter in the signal path, has a full set of dedicated controls. It features 3 dedicated modulation input pots with source selector switches. They are configured and color coded exactly like the existing filter. One important difference: The pot (in red) that sets the amount of envelope generator modulation that affects the frequency of the multi-mode filter, is bi directional. Clockwise is: positive AR or ADSR, Counter-clockwise is: negative and center is: "off". This feature is critical for negative envelope sweeps.

The coarse filter frequency of the multi-mode filter is controlled using the existing high pass filter frequency slider.

There is a dedicated rotary resonance control for the multimode filter.

There is a rotary switch installed at the top of the filter section that selects the bypass mode and the 4 different responses that are routed to the VCA. Here are the responses and rotary switch settings:

    1. Bypass
    2. 12Db High-pass
    3. 6Db Band-pass
    4. 40Db Notch (phase shift)
    5. 12Db Low-pass

The convenient bypass setting removes the second filter from the signal path completely and routes your existing low pass filter directly to the VCA.

LFO FREE RUN SWITCH - ALL MODELS - $69.00

It's impossible to get a slow moving sweep on the LFO while playing your Odyssey's keyboard. The LFO also re-triggers on incoming external gate signals from a remote keyboard. When this switch is in the "free run" position, the keyboard and the external gate input will not restart the LFO as with stock units.

 

EG TIME EXPANDER SWITCH - ALL MODELS - $79.00

This mod installs a professional grade miniature toggle switch (the exact model used in the 2500 modules) in your Odysseys AR or ADSR section that speeds up the time constant on the envelope generator to attain 2600 type percussive envelopes. This upgrade now features a 3 position switch with an extra slow mode for extended attack, decay and release times. Now available for the AR generator.

 

VCF FM3 INVERTER SWITCH - ALL MODELS - $69.00

This mod installs a professional grade miniature toggle switch and circuitry that inverts the frequency modulation input #3 of the VCF. This will give you the ability to sweep the filter downward using negative ADSR envelopes similar to the ARP 2500. The inverter also can invert the AR generator signal going to the filter as well.

 

PORTAMENTO SWITCH AND PUSHBUTTON - ALL MODELS - $99.00

This mod installs a professional grade miniature toggle switch that turns on and off the portamento circuit. When the toggle is in the "off" mode, the pushbutton switch provides a momentary portamento function, facilitating more expressive playing techniques. This upgrade is similar to the portamento setup on the 3620 keyboard for the ARP 2600.

 

REAR PANEL INTERFACE JACKS - FOR THE 2800 ONLY - $179.00

Professionally installed CV, gate and trigger inputs and outputs for the 2800 Odyssey using 1/8th inch Switchcraft jacks. The interface is functional with only CV and gate inputs if desired. This new and improved CMS upgrade features high speed operation of the gate and trigger input signals eliminating the latency problem inherent in the old ARP retrofit for the 2800. If you have the factory interface installed already, we can update it to our high speed version for $89.00

 
     
   
         
   
KITS, PARTS AND ACCESORIES
   
         
 
 

 

4035CX FILTER - 24 Db LADDER FILTER FOR MODELS 2810 TO 2823 - $249.00

CMS has come up with a great sounding filter for the ARP Odyssey 2! The 4035 filter was the second version filter used in the ARP Odyssey for a short time. It is ARPs version of the Moog ladder filter for the Odyssey. Years ago, we made an exact replica of the original but we found it to be too noisy so it was quickly discontinued. After years of development and listening tests, we have come up with a much improved version of the 4035. It exhibits significantly lower noise and better low end response compared to the original without any changes to the original circuit design. It also has a spectacular sound quality. Guaranteed to be temperature stable and free of control voltage feed-through. Now you can have ARPs version of the Moog ladder filter installed in your Odyssey 2 without giving up your original filter! Or vice versa. Compatible with the 2829 secondary filter adapter shown above.

 

UPGRADED 4075 FILTER - FOR MODELS 2810 TO 2823 - $225.00

The ARP 4075 was the third generation 24Db filter used in the ARP Odyssey. It was designed in 1976 by Alan Pearlman and Tim Gillette. This module is a genuine OEM unit. Upgraded to 28Khz and re-tested to factory specs. Guaranteed to be temperature stable and free of control voltage feed-through. Compatible with the 2829 secondary filter adapter.

   
 
         
   
 
     
 

ADDITIONAL INFORMATION:

ODYSSEY PACKING TIPS - click here

Odyssey slider color code

Please e-mail: discrete@discretesynthesizers.com to request more info. Estimates for repairs and restorations are free and will be e-mailed to you for your approval before any work begins on your machine.

 
     
   
 
         
       
 
                       
   
e-mail: filter@discretesynthesizers.com
phone: 912-727-2195 ©2004-2022 Phil Cirocco