Carl Martin Octa-Switch MK3 Multi-Effects Looper

Carl Martin

Octa-Switch III

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Carl Martin Octa-Switch MK3 Multi-Effects Looper

To set up the Octa-Switch MK3, plug up to eight pedals and amp(s) into the appropriate inputs/outputs on the back of the pedal. The pedals can be in any particular order you prefer or you can follow the general rule from 1-8 of compression, overdrive, and modulation. Then by turning on or off the numbered switches in each of eight DIP Bank switches, you determine which effects you wish to use simultaneously in each Bank. There is a blue LED for every effects loop used and for each Bank (so once you are programmed, when you step on Bank 6 you will see the lights of all the effects you have assigned to Bank 6 and the Bank 6 LED). In order for the pedals to work properly with the Octa-Switch MK3, all the pedals must be turned on (when you are using the Octa-Switch MK3, and there are pedals you only use rarely, it is a good idea to turn them off and then on again to disperse any built up charge that could cause a ‘pop’ when you engage them with the Bank switch….a good time to do this is at the end of each set you play!).

Please note, the DIP switches are slide type, NOT push down. They are easily operated with a small screwdriver, a pen, or a very very small finger. There is a buffered or True Bypass (non-buffered) switch at the back of the Octa-switch which you select depending on the stage set-up or your personal preference. On large stages when running long connected cables, there is a definite drop in the high end of your guitar sound (more or less depending on the input impedance of your amplifier). They built in a buffer circuit at the input, so the user can choose between 100% true bypass, or, a buffered bypass to ‘beef’ up the signal.

The Octa-Switch MK3 has stereo outputs as well as the stereo return on Loop 8 (this is a stereo jack with tip-left and ring-right). Since stereo effects like choruses are placed at the end of your effects-chain, they would typically insert them in Loop 8.

The Octa-Switch MK3 has nine switches, the eight are presets and the ninth is an effect Bypass, which will bypass the Octa-Switch MK3 to your un-affected amplifier sound. Please note if the Buffered Input is engaged at the back of the pedal, it will also be engaged in the bypass Mode on top of the pedal, as they work in conjunction with each other. Similarly, if the True Bypass Input is engaged at the back, the Bypass switch on top will switch to a True Bypass signal.

The Octa-Switch MK3 has two external switching jacks for changing channels on your amp(s), or other operational features.

Setting up the External Switches, is as easy as setting up the Banks. The two external outputs correspond to the two DIP switches above them and their Green/Red LED’s. The simplest set-up is with one amp…. plug the amp’s channel switch into the External Switch Jack 1, and select which of the eight banks require a switched channel (ie high gain) by setting the individual DIP Switches to ‘ON’. Now; when you engage Bank 6 for instance, it will automatically switch to high gain rather than having to step on another separate switch.


Type: Loopers


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