The Big Three devices are the most complex examples included with Max for Live and include relatively sophisticated algorithms, user interface tools, and state management. Particularly if you are new to Max, you probably don't want to start trying to learn programming by looking at these devices.
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The Buffer Shuffler is an audio effect that reads
incoming audio on Live audio track into a buffer
and divides the buffer into a user-definable number
of slices. You can change the order in which steps
are played back, the direction of playback, and
reorder playback on the fly using the user interface.
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The Loop Shifter is an unusual MIDI instrument that
uses MIDI notes to trigger different ways of playing
back a loaded audio file. Each MIDI key represents
a collection of stored data bout playback speed and
direction, loop points and filtering. You can use
monophonic or polyphonic input to trigger these
various "states" of the loop, and adjust the
transitions between parameters as new notes
trigger new states.
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The Step Sequencer MIDI effect contains four
independent step sequencers whose editor
looks and acts like Live's native MIDI editor.
You can independently set steps, playback
direction, step size, and loop length for
each of the four sequences, in addition to
other neat tricks.
Note: Like any MIDI effect in Live, you'll need to
have a MIDI Instrument downstream from this
MIDI effect, since the Step Sequencer outputs
generated MIDI notes rather than producing
sound itself.