I used an Abacus for years. I bought it new in the mid nineties and have to say this product is perfect for the Triaxis. I had it paired with the Triaxis and a Lexicon MPX-1 (still do but I am not currently using rack gear at this time). The Lexicon had to be midi mapped so each effect patch could be paired with the Triaxis preset of your choosing. The manual that comes with the multi effects unit should explain this relatively clearly. I have to say the Abacus was long (27") and heavy. But this unit is built like a tank and it can't imagine one breaking down. I recently put it back in commission to work with an Eventide H9 I recently bought and it works as well as ever...a great product. I have to say the I've is a bit imposing nd I am shopping for smaller footprint that is lighter. Also, it isn't "smart" meaning you can't program complex configurations of effects chains, using all of your other pedals like most of today's midi foot controllers (ala the Voodoo Labs Ground Control) but in its defense, I'm not interested in doing that at this time...