The Carl Martin Octa-Switch MK3 features 8 true-bypass relay loops with complete signal isolation for each pedal, delivering transparent tone preservation and silent switching across your entire pedalboard. It offers instant preset switching via hardware-based DIP switch programming, allowing you to engage multiple effects simultaneously with a single footswitch. The unit includes a dedicated global bypass switch to remove all loops instantly, alongside individual LEDs and bank indicators for clear visual status on dark stages. For advanced routing without additional gear, it is equipped with two external switching outputs to handle amp channels or external devices, a switchable input buffer to accommodate various rig setups, and full stereo output support.

When Carl Martin designed Octa-Switch MK3 together with Thomas Guldmann, the goal was simple: give players full control over complex pedalboards without tap-dancing, menu diving, or digital abstraction. Carl wanted instant access, absolute reliability, and a signal path that stays transparent no matter which pedals you use.

Octa-Switch MK3 is built around eight true-bypass relay loops. Each of your pedals lives in its own loop, completely isolated when not in use. Using the DIP switches for each bank, we decide exactly which pedals are active in each preset. Step on a single footswitch, and an entire combination of effects engages at once — clean, silent, and repeatable every time.

Visual feedback is immediate. Each active loop has its own LED, and each preset bank is clearly indicated, so we always know exactly what’s happening underfoot — even on dark stages.

To keep the rig flexible, Carl included a dedicated global Bypass switch. With one press, all eight loops are removed from the signal path, providing the pure, unaffected sound of the amplifier. It’s the fastest possible way to reset the rig mid-song or between sections.

Octa-Switch MK3 also includes two external switching outputs. These can be used to switch amp channels, control multiple amplifiers, or interact with other external devices — making the unit suitable for far more than just pedals.

The input buffer is switchable, allowing us to run either buffered or unbuffered input depending on cable length, pedal choice, and personal preference. The output is stereo, supporting more advanced rigs without additional routing gear.

Programming is intentionally hardware-based. Once the DIP switches are set, the presets are fixed, predictable, and immune to accidental changes. For live use, Carl Martin recommend covering the DIP switches after setup — not because it’s fragile, but because reliability matters.

Octa-Switch MK3 is housed in a solid metal enclosure and powered either by batteries or an external regulated power supply. It’s a professional loop switcher built for players who want maximum control with minimum complication.

Key Features

• Programmable loop switcher with 8 loops
• True bypass with buffer option
• MIDI-compatible external switching
• Store up to 32 presets
• Solid metal construction

Dimensions: 311 x 155 x 65 / 12.24″ x 6.10″ x 2.56″
Weight: 1.6 kg / 3.53 lbs

Specifications

• Input: 500K Ohm (buffer)
• Output: 560K Ohm (buffer)
• S/N Ratio: 70 dB
• Loops: 8 pcs. true bypass relay
• Presets: 8 pcs via DIP switch
• External Switch: 2 pcs (latching)
• Power consumption: max. 380 mA
• Power supply: 9 V DC (regulated), 500 mA minimum, 2.1 mm female plug, center negative (-)

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