How To Modify the MXR Carbon Copy Analog Delay

This tutorial demonstrates how to modify the MXR Carbon Copy Analog Delay so that it receives the clock signal from Delaytion, PedalSync's analog delay control station, which features tap tempo, modulation, and four program storage.

Why modify the Carbon Copy?

1) tap tempo timing with 3 delay ratios
2) create and recall four presets
3) no need to open up the pedal to change modulation ratio and depth

Delaytion can control most analog delays based on the Panasonic MN3205 and MN3208 chips and their clones. This includes the Malekko Ekko 616 and Build Your Own Clone's Analog Delay.



If you would rather have Molten Voltage perform this modification for $30, click here for more information.



Click here to order Delaytion. 


Dissemble your Carbon Copy as follows:

Remove the four (4) bottom screws. Use the right size Philips screwdriver, as they are tight!

Remove the sticky-back paper that covers the circuit board.

Pull off the three (3) knobs.

Remove the nuts from the three (3) pots with an 11mm wrench, and remove the washers.

Remove the nut from the footswitch with a 14mm wrench, and remove the washer.

Remove both side jack inserts with an 11mm wrench and remove the lock washers.

Remove the circuit board.

Remove the inside lock washers from the pots.

Avoid touching the chips, trimpots, and other components on the circuit board.


This photo shows the parts that will be modified.

Pins 1 and 2 of the 4047 chip are the ones on the lower left corner.

All three pot lugs will be de-soldered and removed.


Desolder the three (3) delay pot lugs and remove the delay pot.

Do not desolder any other parts or touch any trimpots!


Desolder pins 1 and 2 of 4047 chip with desodlering braid, being careful not to desolder or touch any other pins or components.

Lift pins 1 and 2 clear of the PCB with a sharp, curved pick.


Install an RCA jack with washer in the former Delay pot hole.


Connect a jumper wire from the outside hole for the delay pot to the RCA jack center lug.

Delaytion and the Delay need to share a common ground, so if you are not using a daisy-chain power connection, connect the first lug of the center pot to the ring of the RCA jack, as shown by the white wire in the photo.


Put everything back together.

Do not overtighten the audio jacks!

Get everything snug, but not overtight - the parts can break.




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Disclaimer: Carbon Copy is a trademark of Dunlop Manufacturing Inc. which is unrelated to Molten Voltage.

Information contained in this publication regarding device applications and the like is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. MOLTEN VOLTAGE MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Molten Voltage disclaims all liability arising from this information and its use. No licenses are conveyed, implicitly or otherwise, under any Molten Voltage intellectual property rights.

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PedalSync, Delaytion, Tru-Foot, ReMute, NODE, Molten Voltage, Visionary Effects, DIGITAL CONTROL : ANALOG SIGNAL, "Design simple Design sublime", and "the future just showed up" are all trademarks of Molten Voltage.