The "Heap MIDI Receiver" is a Max for Live device that allows you to receive MIDI notes from my other devices “Heap MIDI Sender” ( https://gum.co/dWKoS ) and “4 Voice Splitter” ( https://gum.co/uHCWb ). Just set the "Bus In" on the Receiver to the same channel as the "Bus Outs" on the Sender or Splitter and you're good to go.
This is a modified version of the “Max MIDI Receiver” from the “Max 7 Pitch and Time Machines” pack ( https://www.ableton.com/en/packs/max-7-pitch-and-time-machines/ ). This means it will also be compatible with the "Max MIDI Sender" from the same pack. This version has more channels, is less user friendly and can receive individual pitches.