Unfortunately, this is no longer available, but perhaps the Related offers may be of interest.
huendeskes It's not rocket science, you can switch your non-MIDI amplifier with it via MIDI. It can handle 4 such function switches. (practical example, you take a multi-effect with a MIDI output, connect it to this and the amplifier's channel switch, when you change banks it switches the channel as you set it.) Programming is infinitely simple. Quality stuff.