Robin Gareus http://gareus.org/
3 Pedalboards using it

MIDI Duplicate Blocker

Plugin screenshot

MIDI Duplicate Blocker enables you to filter out overlapping notes on/off and duplicate messages. Features: Modeled by x42

Control Default Min Max
Filter Channel 0 0 16
latency 0 0 192000
http://gareus.org/oss/lv2/midifilter#nodup v.1:1033.31-12