All questions and comments welcome.   Marshall JVM Channel Switching with Helix MIDI This works with Helix Firmware Version 2.20 and later. PURPOSE - Have your JVM automatically switch to any desired channel preset combination when pressing any Helix Preset or Snapshot button. IMPORTANT - Following the procedures described here may cause you to lose any MIDI switching settings you already have programmed into your Helix and JVM.   IMPORTANT: Set Helix MIDI Global