
Anthony Easton
The Octa-Switch MK3 by Carl Martin is a versatile effects pedal switcher designed to accommodate up to eight effects pedals. It features eight effects loops on the back, all of which are true-bypass, impedance-free, and equipped with gold relays. Users can activate or deactivate the numbered switches in each of the eight DIP Bank switches to determine which effects to use simultaneously in each bank. Each effects loop used and each bank is indicated by a blue LED, providing clear visual feedback.
The Octa-Switch MK3 also includes a bypass switch, allowing users to bypass all eight pedals and enjoy the unaffected sound of their amplifier. Additionally, it features two external switching jacks for use with two amplifiers and/or for switching channels on those amps. The unit offers a buffered (or switchable) mono input and a stereo output. It can be powered by dual 9V batteries or by a regulated power supply, such as the PowerJack or the Pro Power, both by Carl Martin.
The pedal has received positive reviews for its mechanical simplicity, ease of use, and sound quality. It is praised for its ability to store and recall up to eight different combinations of connected effects with a single button, making it a game-changer for many players. The Octa-Switch MK3 is also noted for its dead-silent switching and its capability to keep unused effects completely out of the signal path, contributing to improved sound quality.
Dimensions (W x D x H): 311 x 155 x 65 mm
Weight: 1.6 kg
Price:
- EU incl. VAT: 399.00 €
- USA/Non-EU: $427.00
Watch the latest video demos and reviews for the Octa-Switch MK3 from YouTube. Stompbx updates this every six months to reflect the most popular reviewers and guitar pedal demos for each pedal.

Below are live Reverb listings for the Carl Martin Octa-Switch MK3 from Reverb. Stompbx automatically aggregates current offers to give you a quick look at available models, conditions, and prices. Perfect for comparing options and making an informed purchase.

Brand New
$429

Very Good
$369.70

Fair
$281.99

Very Good
$362.47

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Anthony Easton
Anthony Easton
Anthony Easton
Anthony Easton
Anthony Easton
Anthony Easton
Anthony Easton
Anthony Easton
Anthony Easton
Anthony Easton
Anthony Easton