Max for Live lets you create MIDI effects devices which receive MIDI information
from the Live application, perform some operation on that data (e.g. mapping incoming
notes to a user-definied musical scale), and then pass MIDI data downstream to
another MIDI effect or to a MIDI Instrument - the last device in a MIDI effects
chain (although the audio output of the instrument may be further processed
by any number of Audio effects devices).
By convention, Max for Live gets all its MIDI data from the Live application
using the midiin
object, and all of that data must all be passed downstream to other MIDI
devices by means of the midiout
object. Max for Live provides a means to redirect
portions of an incoming MIDI data stream for processing while leaving the rest of
the stream unchanged, as described below.
Also by convention, all Max for Live MIDI devices receive audio on MIDI channel 1.
You can receive receive MIDI data in your Max for Live MIDI Effects
device on a channel number other than 1 by routing the MIDI input as described here.
Max for Live provides several tutorials and example MIDI effects devices
you can try, study, and modify:
Max for Live requires that all MIDI data coming into a MIDI Effects
device be passed downstream. There are situations in which you may
want to use only a portion of the incoming MIDI data stream - to select
only MIDI notes in a given range, or input from specific MIDI continuous
controllers for use in your device. The Max midiselect
you specify portions of an incoming MIDI data stream to filter out for
further processing in your device, and passes any other MIDI data out