I know this is an older post, but I figured I would comment if it is helpful to other users. I've been researching this for a Laney Lionheart amp to control by MIDI which has different connections than Laney IRT mentioned. Based on the OP's diagram in their original post, the IRT uses a 5-pin connector that looks like MIDI, but is not. It is just a standard 5-pin DIN connector. This is used by MIDI but is not exclusive to MIDI. The reason they use a 5-pin DIN instead of 1/4 connections is because they are running four channels of switching over one cable to the foot switch. You would still need something like the Voodoo Lab Control Switcher which handles 4 channels of switching. You would then need to connect the MIDI out of whatever controller you are using (POD HD500/HD500x, Helix LT, HX Stomp, etc) to the MIDI in of the Voodoo Lab Control Switcher. From there you would need to use some basic electronics knowledge and some soldering skills and make up a custom Pigtail cable to interface between the Voodoo Lab Control Switcher and the amp. In my case I would need to make a Y cable that goes from two TS 1/4" connectors to a one TRS 1/4" connector. In the case of the IRT based on the diagram above, one would need to have (4) TS 1/4" connectors going into a single 5-pin DIN connector to control all four channels (lead/clean/reverb/boost) on the amp. The 1/4 outs on the Voodoo Lab Control Switcher are relays. One relay per channel, so it is mimicking electrically what a foot switch would do. Then it is just a matter of mapping the correct MIDI commands and channels to a foot switch in the the controlling device (POD HD500/HD500x, Helix LT, HX Stomp, etc).