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Pete Cornish OC-1 Optical Compressor Effects Pedal - Used  From Other

An Incredibly Transparent Two-Stage Compressor from Pete Cornish!


Buy Pre-owned from Sound Pure with Absolute Confidence

Sound Pure's dedication to pre-owned products is unprecedented in the industry. We are a small team of dedicated experts that buys, trades, and consigns. We are trusted by customers all over the world. Our curated collection, is thoroughly tested and inspected by some of the best in the business. Our inventory is constantly changing, ever-evolving, with some items sold before reaching the website. Looking for something specific? Have questions about this product's condition or history? Want more photos, or to simply chat with an expert who's had his hands on this actual piece? Contact us now.
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Other (Miscellanous Used/Vintage/Consign)

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This one is sold. Don't miss the next one. Some things never even make it to the site so stay up to date on our used collection.

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What We Think

Condition: Used, Excellent

Manufacturer's Description from Other

After many years in the development, we are proud to present our first Optical Compressor: designed specifically for, but not limited to, guitar.

In common with our recently introduced CC-1, the OC-1 is a completely original design, not copied from any previous or current device.

A Feed-Forward design, the OC-1 features a minimized two stage audio signal path: input buffer and output make-up gain: this ensures no change to frequency response, no distortion and the absolute minimum of added noise. Between the two audio sections is a light controlled variable attenuator driven with a control current generated by the Side Chain. All signal monitoring and gain reduction drive circuits that are separately routed via a six stage Side Chain: these signals do not pass through the audio circuits and thhus cannot degrade the audio performance.

Operation is straight forward:

Connect guitar using screened cable to the OC-1 INPUT

Connect OC-1 OUTPUT using screened cable to your amp input

With OC-1 in bypass mode set guitar volume and tone to 100% (maximum)

Set amp volume and tone to suit normal playing level

Set all OC-1 controls to minimum (fully counter clockwise)

Engage OC-1 and note that the signal level and tone as the same as when in bypass mode IE: minimum settings create no compression or output boost

Increase the COMP (compression) control to approximately 50% (12 o'clock) while playing and note the decrease in output volume and increased sustain. Increase the VOLUME in small increments until the output level matches the bypass level - compare by switching back and forth between bypass and OC-1

If the sustain is too great reduce the COMP setting and also the VOLUME to again match the bypassed level

If more sustain is required increase the COMP setting above 50% and make corresponding increases in VOLUME to again match the bypassed level. Actual settings will be dependant on pickup signal level, playing style and of course, personal preference

A further feature has been added: BLEND. This control allows you to add a small percentage of the original, uncompressed signal to the OUTPUT. This is particularly useful when very high compression settings have been dialed in, as a controlled amount if the original attack can still be heard through with the long sustain. Please note that the control increases in relation to the compressed signal as the VOLUME is increased. When adding the BLEND signal it will be necessary to reduce the VOLUME to maintain the overall signal level to match the bypassed level. The VOLUME control is at the very end of the audio path and is a master volume of the whole of the output signal in compress mode.

The OC-1 would normally be the first device the guitar "sees" thus maintaining signal level more constant.

Other (Miscellanous Used/Vintage/Consign)

About Manufacturer

Here at Sound Pure we hand-select used and vintage pieces of gear for our inventory. Our used selection always reflects the high standards of quality and craftsmanship that we expect from all of our manufacturers.   We are a small team of dedicated experts, located in Durham, NC.  We buy, trade, and consign instruments that we truly believe in.  Because of this, we have developed a reputation of quality and trust with our customers, located all over the world.   Our best customers are the ones that truly understand our personal touch and commitment to everything we sell, and range from hobbyists and enthusiasts to some of the biggest names in the business.  Our passion bridges the products we love with the real relationships we develop with our customer - whether they are a lifelong musician, or they are just getting started on their musical journey but care about value, quality, and being treated right.  

We vigorously test everything we take in to ensure authenticity, functionality, and reliability.  We are supported by one of the most well-respected luthiers in the Southeast, guaranteeing products that come in are thoroughly vetted, and that products that go out our in premium, performance- ready shape.   We are so confident in our ability to provide the highest quality music equipment in the industry, we even invented our “Try Before You Buy” program where we can ship out a product before collecting actual payment. 

Sound Pure's inventory is constantly changing, ever-evolving, with some items sold before reaching the website.    Looking for something specific? Have questions about this product's condition or history?  Want more photos, or to simply chat with an expert who's had his hands on this actual piece of gear?  It is truly our pleasure to talk with our customers, please do contact us now.  


High Impedence RFI rejecting input and bypass buffer

Each unit is hand built, wired and tested by Pete, Lynda and Mingus Cornish

Housed in a rugged Die-cast box

Heavy Duty all metal footwsitch with Hi-Brite LED

DIMEMSIONS: 145 X 95 X 49 mm

Power Supply: 9v DC