Carl Martin Route Box A/B switch was purchased new. Out of box performance is flawless. Switching is soundless... no scratching, squealing, etc.. A/B routes together two amplifiers, Mesa Road King and a Fender Jam. Any two guitar combination (Gibson's/Ibanez) used in performance, performed very well. The Carl Martin RB is highly recommend for semi as well as serious work.

I just purchased the Carl Martin Route Box and have now had an opportunity to integrate it into my pedal board and give it a thorough evaluation. I play both electric and acoustic guitars in a blues band, using two different amplifiers. I wanted to use a single Boss TU-2 tuner for both guitars and make guitar/amp swaps quick and painless. Not knowing the best approach for this, I nosed around and discovered this pedal, which seemed custom-designed for my needs. Even though another reviewer complained that his unit had arrived with one channel malfunctioning, my experience is that Carl Martin makes very high quality gear so I swallowed hard and placed my order. I had no reason to worry - the unit I received works exactly as advertised. It's built like a tank, is extremely quiet, doesn't affect my tone at all, and switches silently between guitars and amps. The different color LEDs for the two different channels is a nice touch. My only complaint is the slightly high price for the unit, but I would rather pay a little more for a solid, reliable piece of gear than save a few bucks and wind up with a paperweight. I am very satisfied with this unit.

I purchased the Carl Martin Route Box Double A/B Footswitch. I was disappointed to find the instrument 2 input didn't work. The user guide? Ha ha... was a joke. Woefully inadequate; it's nothing more than a data sheet with a set up diagram & specs.. Maybe they forgot to throw the user guide? I'd steer clear. I exchanged down for the Radial Engineering Big Shot I/O. Not as big on the features, but gets the job done and works just fine with my pedal board.