LV2 plugins to filter MIDI events.

So far 29 MIDI event filters have been implemented:

• CC2Note -- translate control-commands to note-on/off messages
• Channel Filter -- discard messages per channel
• Channel Map -- map any MIDI-channel to another MIDI-channel
• Choke Filter -- trigger note-off events, create exclusive note-groups
• Enforce Scale -- force midi notes on given musical scale
• Eventblocker -- notch style message filter. Suppress specific messages
• Keyrange -- discard notes-on/off events outside a given range
• Keysplit -- change midi-channel number depending on note (and optionally transpose)
• MapCC -- change one control message into another
• Mapscale -- flexible 12-tone note map
• Mapkeychannel -- 12-tone channel map.
• Chord -- harmonizer - create chords from a single note in a given musical scale
• Delay -- delay MIDI events with optional randomization
• Dup -- unisono - duplicate MIDI events from one channel to another
• Strum -- arpeggio effect intended to simulate strumming a stringed instrument (e.g. guitar)
• Transpose -- chromatic transpose MIDI notes
• Legato -- hold a note until the next note arrives
• NoSensing -- strip MIDI Active-Sensing events
• NoDup -- MIDI duplicate blocker. Filter out overlapping note on/off and duplicate messages
• Note2CC -- convert MIDI note-on messages to control change messages
• Note2PC -- convert MIDI note messages to patch/program change messages
• NoteToggle -- toggle notes: play a note to turn it on, play it again to turn it off
• nTabDelay -- repeat notes N times (incl tempo-ramps -- eurotechno hell yeah)
• Simple 1 Channel Filter -- convenient MIDI channel filter
• Passthru -- no operation, just pass the MIDI event through (example plugin)
• Quantize -- live midi event quantization
• Velocity Randomizer -- randomly change velocity of note-on events
• ScaleCC -- modify the value (data-byte) of a MIDI control change message
• Sostenuto -- delay note-off messages, emulate a piano sostenuto pedal
• Tonal Pedal -- hold active notes when pressing the sustain pedal
• Velocity Range -- filter MIDI note events according to velocity
• Velocity Gamma -- modify note velocity curve by a gamma exponent
• Velocity Scale -- modify note velocity by constant factor and offset

Compiling the plugins requires LV2 SDK, gnu-make and a c-compiler.

  git clone https://github.com/x42/midifilter.lv2.git
  cd midifilter.lv2
  make
  sudo make install PREFIX=/usr