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Ok, so you have eight effects pedals which you use regularly. You use various combinations of these pedals in various songs, but you are not good at tap dancing…or you are just clumsy and have (once or twice) stepped on the ultra tricked out-metalized-distortion pedal for the lead in your one ABBA cover. You have seen the digital effects controllers they use on the big stages, and have secretly yearned for one… even though you may never make the big stage. Enter Thomas Guldmann’s Octa-switch MK3. Your eight effects plug into the eight effects-loops on the back of this unit (all true-bypass, impedance free, gold relays so you can run any of your pedals, new and old without problem), and 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). The Octa-switch MK3 has incorporated a couple new features as well! The ninth switch on the left side of the case is a BYPASS Switch….this allows you to completely bypass all eight pedals and enjoy only the unaffected sound of your amplifier. There are also two External Switching jacks which allow you to use two amplifiers and/or switch channels on those amps. Once you have all the Banks programmed, we recommend placing a piece of scotch or electrical tape over each DIP (….just to protect the switch from accidental switching, damage or floods….like beer). There is a buffered (or not….switchable) Mono input and a stereo Output, and the unit is powered by dual 9v batteries, or by a regulated power supply…like the PowerJack or the Pro Power (both by Carl Martin).

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. (A quick performance note is required here….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). The solution according to Thomas was once again ‘simple’. He 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, we 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.

Please note that different amplifiers and different amplifier companies use different switching systems. If plugging straight into the Octa-Switch MK3 does not give you the desired result, we suggest you contact your local qualified amp technician and have him make the required change to your amp’s switch, so it will function with the Octa-Switch MK3. (It is impossible to have a switching system that will work with every amp on the market, but because all switching systems are similar, it should be possible to have them all work with the Octa-Switch MK3 with! For safety reasons, we do not recommend you open or attempt to service this pedal, your switches or your amplifiers unless you have the proper qualifications!)



This is what they say


Harmony Central (US) Nov 20, 2015
The Carl Martin Octa-Switch Mk3 can put an end to your tap-dancing days. For many players, this pedal is going to be a game-changer, allowing them to store and recall up to eight different combinations of the connected effects with just a single button. It’s very easy to set up, and those who don’t want to learn MIDI commands and deal with menus and complicated programming can now enjoy some of the same benefits that have largely been limited to more elaborate MIDI switching systems in the past.

The flexibility of this pedal is impressive, but so is the sound quality. Switching is dead silent, and the Octa-Switch Mk3 doesn’t add any appreciable noise to your sound. In fact, for many users, it’s going to make things sound better because it keeps everything you’re not using at any given moment completely out of the signal path – including the extra cabling. Build quality is what you’d expect from Carl Martin – in other words, excellent.

I’ve really been enjoying the Octa-Switch. It allows me to call up vastly different preset sounds comprised of multiple analog effects with just a single button push – something that would otherwise be impossible to pull off. While I do wish it had a stereo input / output loop, and maybe a few more loops in general (I have a LOT of pedals), there’s very little else about this incredible loop switcher that I could find fault with. If you loathe menus and MIDI but want to have the ability to create complex sounding multi-effects presets using the pedals you already own, then you owe it to yourself to check out a Carl Martin Octa-Switch.

Premier Guitar (US) Feb. 2016
Carl get a PG Award for the Octaswitch MK3 in Premier Guitar’s Feb issue for the mechanical simplicity of the Octa-Switch MK3, great value, incredibly easy to use.
Though it may lack some fancy digital features, the MK3 is capable of a lot more than just switching pedals on and off. You can use it as a killer A/B switcher to route two guitars into two separate amps, with each pair attached to its own group of effects. Just bypass the standard in/out controls and patch everything through the loop jacks.

The mechanical simplicity of the Octa-Switch MK3 is a beautiful thing. The intuitive design means neophytes can get started fast without consulting a manual. And it’s simple enough to make troubleshooting a breeze in performance situations. In an era in which many switchers are as complex as some multi-effects units, the MK3’s what-you-see-is-what-you-get layout cuts through all the frivolities. This bad boy lets you just program the configurations you’ll actually need rather than bog you down with hypothetical possibilities you’ll never actually use.
See the complete review here:



Artists using the Octa-Switch MK3


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