Multiple MIDI Program Changes
Q: I need to send out several different MIDI program changes on different MIDI channels at the same time by pressing one button. Is there a device that can do this?
A: One solution might be the RJM Music MasterMind, which can send out four program changes and eight control messages per preset, all on different MIDI channels.
The Voodoo Lab Ground Control can also control up to eight different devices, each on its own MIDI channel.
Some MIDI devices support patch mapping, which may allow you to address the presets you want in each, using a single MIDI program change message on one MIDI channel.
Or, you could re-order the presets in your devices so that a MIDI program change message sent on one channel calls up the proper combination of presets in all of your devices.