MIDI Filter Rule Language

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The MIDI Filter Rule System is integrated in the webconf tool. You can create your rules by hand or using the “rule composition” dialog.

We have developed a simple MIDI Filter Rule Language that can be used for creating rule-sets. These "rule-sets" can do a lot of interesting tricks with your MIDI input flow. If you have a MIDI-OUT, you can also use your Zynthian Box as a powerful standalone MIDI filter.

Here is the MIDI Filter Rule Language syntax:

Rule Formats:

IGNORE [CH#??] EV[#??]
MAP [CH#??] EV[#??] => [CH#??] EV[#??]
CLEAN [CH#??] EV[#??]

Event types:

CC#?? => Continuous Controller Change (??=controller number)
NON#??, NOFF#?? => Note-On, Note-Off (??=note number)
PC#?? => Program Change (??=program number)
KP => Key Pressure (aftertouch)
CP => Channel Pressure (aftertouch)
PB => Pitch Bend

Numeric expressions:

5	=> a single number
5,6,7 => a list of numbers
5:7	=> a range of numbers, including both limiters
1,2,3:5	=> a mix of lists and ranges

Some Examples:

IGNORE CH#2 PC => Ignore Program Change events coming from channel 2
MAP CH#1 CC#7 => CC#1 => Map Volume Control events from channel 1 to Modulation Wheel events in the same channel
MAP CH#1 CC#0:127 => CH#2 CC#0:127 => Map all CC (Continuous Controller) events from channel 1 to channel 2
MAP CH#0 NON#0:45 => CH#1 NON#0:45
MAP CH#0 NOFF#0:45 => CH#1 NOFF#0:45 => "Split" your keyboard, sending the lower notes (until A-1) to channel 2