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

MIDI Chromatic Transpose

Plugin screenshot

Chromatic transpose of midi notes and key-pressure. If an inversion point is set, the scale is mirrored around this point before transposing. Notes that end up outside the valid range 0..127 are discarded.

Control Default Min Max
Filter Channel 0 0 16
Transpose 0 -63 64
Inversion point MIDI note C MIDI note C MIDI note G
latency 0 0 192000
http://gareus.org/oss/lv2/midifilter#miditranspose v.1:1033.31-10