Description: These plug-ins create new MIDI notes based on incoming data or from internal pattern engines. They add musical material rather than only modifying it.

How it's created: They rely on programmable patterns, algorithms, chord expansion rules, or arpeggiation engines.

Logic Pro Plug-ins in this Category:

• Arpeggiator — Converts held chords into rhythmic, ordered note sequences with full control over rate, direction, and pattern.

• Chord Trigger — Turns single notes into full chords; great for complex voicings or performance-friendly harmonization.

• Modulator (as a note source) — Can generate MIDI CC or pitch data from internal LFOs/envelopes that trigger note-related behaviors.

• Randomizer (pitch/gate modes) — Adds controlled randomness to pitch or note timing, creating generative unpredictability.

What it's best for:

• Creating evolving patterns

• Making simple performances sound richer

• Building chord progressions quickly

• Live performance enhancement

• Generative music setups

Description: These plug-ins modify existing MIDI notes without generating new material. They reshape pitch, velocity, timing, and dynamics.

How it's created: They apply mathematical offsets, maps, or rules to incoming note data (transposition, scaling, filtering, velocity curves, etc.).

Logic Pro Plug-ins in this Category:

• Modulator (as a transformer) — Uses LFOs/envelopes to alter CC or pitch data in motion over time.

• Note Repeater — Repeats incoming notes at chosen rhythmic divisions, transforming rhythm while preserving pitches.

• Randomizer (velocity/timing modes) — Introduces natural-sounding variations to simulate human performance.

• Transposer — Shifts incoming MIDI notes up or down by intervals, scales, or custom key settings.

• Velocity Processor — Shapes and remaps velocity using curves, compression/expansion, limits, and dynamic scaling.

What it's best for:

• Humanizing MIDI

• Dynamic control of synths/samplers

• Making parts feel more expressive

• Harmonic or scale-based pitch control

• Rhythmically transforming played parts

Description: These effects change or generate continuous controller (CC) data, affecting modulation, expression, or any automatable parameter.

How it's created: They use internal LFOs, envelopes, curves, or mapping systems to modify CC or pitch bend data.

Logic Pro Plug-ins in this Category:

• Modifier — Maps one MIDI signal to another (e.g., velocity → filter cutoff), with scaling and curve shaping.

• Modulator — Creates LFO and envelope-driven CC signals (vibrato, filter sweeps, tremolo, etc.).

• Randomizer (controller mode) — Adds variations to CC data for organic movement.

• Scripter (if used for CC tools) — Allows custom-written scripts for MIDI CC manipulation or automation logic.

What it's best for:

• Synth modulation

• Creating evolving textures

• Mimicking analog movement

• Custom control routing

• Expressive live-performance setups

Description: These plug-ins introduce controlled randomness to pitch, timing, velocity, or CC data, enabling natural feel or generative output.

How it's created: They apply stochastic models (probability distributions, ranges, bipolar offsets, etc.) to incoming MIDI.

Logic Pro Plug-ins in this Category:

• Arpeggiator (random pattern mode) — Generates randomized arpeggio orders.

• Randomizer — Adds variations to pitch, velocity, gate, timing, and controller data.

• Scripter (probability scripts) — User-written scripts can create probability-based grooves or note generators.

What it's best for:

• Generative music

• Humanized sequences

• Textures that evolve over time

• Avoiding mechanical repetition

• Aleatoric composition techniques