I've long had an ADA Stage Head with MP-1, MP-1C, and MP-2. Over time I added the ISP Decimator Pro Rack G Stereo Noise Reduction system. Now I've completed the system with a Rockman Patchmate 8 MIDI Effects and Audio Switcher! All are controlled by a RJM Mastermind GT16 (or Keith McMillen Softstep 2). The case is a 5U RMC Modular Headcase with 10 AC outlets built-in.
The three ADA preamps are on MIDI channels 1,2, and 3 respectively. The Patchmate is on MIDI channel 4. Both the Mastermind GT16 and Softstep 2 are capable of transmitting multiple program change and continuous controller messages on multiple channels for each switch. The RJM also has a programmable display for each foot switch, which comes in handy for preset labeling. I wish I could use an ADA foot controller, but none have this capability.
With one switch I can select which preamp to play through, along with a starting preset; then with the RJM in instant access mode I can change the presets for it without affecting the other two preamps. Altogether I can program the 22 switches on the RJM for any combination of preamps and presets (I doubt I will ever use the 768 maximum presets!). I'm still working on the expression pedal hook up for MP-2.