Type / Platform
• WoodPecker – AUv3, VST3, AAX, and standalone (iOS + macOS).
• Quantum – iOS universal app using CoreMIDI.

Primary Design
• WoodPecker – Probability-driven modular sequencer with MIDI 2.0 features.
• Quantum – Multi-track, analog-style step sequencer modeled on classic hardware, with deep modulation and automation logic.

Track / Sequencer Count
• WoodPecker – 4 independent sequencers.
• Quantum – 6 main sequencers, expandable to 24 (each sequence can have 4 parts: A–D).

Steps per Sequence
• WoodPecker – 64 steps, each with up to 4 variations (total 256 possible).
• Quantum – 64 steps per sequence, and each sequence or part can use any subset of those steps.

Step Resolution / Timing
• WoodPecker – Per-step delta-time factor (0.5× to 2×).
• Quantum – Per-sequence tempo division and per-step gate length from 0 % to 400 %.

Loop & Direction Modes
• WoodPecker – Forward, reverse, random, skip, and probability-based modes; can resync after a chosen number of bars.
• Quantum – Multiple loop types defining playback order and jump patterns.
 Common loop modes:
 – FWD : steps play start → end → start again.
 – REV : steps play end → start → end again.
 – FWD/REV : ping-pong style alternation.
 – Random : choose random step order (via step skips).
 – F3B2 : “forward 3, back 2,” skipping and reversing for pattern variation.
 – F2B1, F4B3, etc. – shorthand for other forward/back skip combinations.
 – Custom per-step jump modes: each step can be marked to jump to another step.
 – Per-step skip flags to shorten sequences dynamically.

Variations / Parts
• WoodPecker – 4 variations per sequencer.
• Quantum – Up to 4 parts per sequence, each with its own tempo division, transpose, and range.

Per-Step Controls
• WoodPecker – Note, velocity, probability, ratcheting, delta-time, mute/skip, humanize.
• Quantum – Note, velocity, gate %, MIDI channel, swing %, probability %, humanise %, mute, 16 assignable CC/NRPN lanes, ratcheting, repeats, and step-level chord options.

Randomization / Probability
• WoodPecker – Step probability, random note and velocity range, and a scale-limit option.
• Quantum – Per-step probability and humanize parameters; “Randomise Notes” can also be triggered automatically as a loop action.

Scale & Key Handling
• WoodPecker – Built-in or user-defined scales; random notes can be limited to the selected scale.
• Quantum – Complete key and scale system with custom semitone mapping; user can remap any of the 12 semitones, set enharmonic spelling, and build custom scales beyond Major/Minor.

Transposition System
• WoodPecker – Global or per-sequencer transpose; can resync or restart sequences after transpose.
• Quantum – Hierarchical transpose system including:
 1. Linked faders for manual shift.
 2. Per-sequence or per-part transposition (-24 to +24 semitones).
 3. Global song transpose affecting all sequences.
 4. Value-only “transpose sequences” that output offsets to other sequences.
 5. Loop Follow Actions that can apply transpositions automatically.

Tempo & Sync
• WoodPecker – Internal 10–1000 BPM, tap tempo, DAW or MIDI clock sync.
• Quantum – Internal clock, Ableton Link, Audiobus 3 MIDI, MIDI Clock, or Note-In driven step advance.

Start / Trigger Options
• WoodPecker – Manual start, DAW transport, Note On trigger, MIDI RT start/stop, or audio input trigger.
• Quantum – Manual or external start via Ableton Link, MIDI Clock, or Note In (keyboard notes can drive step advance).

Ratcheting / Ornamentation
• WoodPecker – Step ratcheting with adjustable timing and probability.
• Quantum – Ratcheting and ornamentation per step, multiple repeats and rhythmic subdivisions, stored in the step options.

MIDI CC Automation
• WoodPecker – Per-step CC assignment.
• Quantum – Up to 16 user-definable CC/NRPN slots per sequence (7- or 14-bit precision).

MIDI 2.0 Support
• WoodPecker – Full MIDI 2.0: 16-bit velocity, 32-bit CC, per-note pitch, MIDI Group addressing.
• Quantum – MIDI 1.0 only (CoreMIDI).

Global MIDI Routing
• WoodPecker – Global output and per-sequencer channel routing; Bluetooth MIDI supported.
• Quantum – Each sequence can target any CoreMIDI device or virtual port with independent channels.

Synchronization
• WoodPecker – Internal or external DAW/MIDI clock.
• Quantum – Ableton Link, Audiobus 3, MIDI Clock, Bluetooth, or Virtual Ports.

Follow / Automation System (Quantum Only)
Quantum includes a complete Loop Follow Actions system that executes when a sequence or part completes its loop.
Actions are organized into four categories:

1. Logic Flow & Counting
• Restart Actions – resets the list and starts again.
• Loop x more times – repeats a loop a specified number of extra cycles before proceeding.
• Wait x loops and y steps – introduces controlled delays before the next action.

2. Sequence or Part Parameter Changes
• Transpose to value x (absolute).
• Transpose +⁄– x (relative).
• Change Tempo Division.
• Change Loop Type.
• Change Start Step.
• Change End Step.
• Mute / Unmute Sequence or Part.
• Mute / Unmute specific Step.
• Randomise Notes.
• Change Key Scale.
• Change MIDI Channel override.

3. Playback Actions
• Stop sequence or part.
• Start specific Sequence or Part.
• Start relative Sequence (+1, –1).
• Start random Sequence.
• Start random Sequence excluding current.
• Start Part in current Sequence.
• Start relative Part (+1, –1).

4. Big Data Changes
• Load Version (switch to another saved state).
• Load Relative Version (+1, –1).

Each action can have its own probability percentage, so execution is non-deterministic if desired.
Action lists are stored per part, can be copied between parts, and can trigger each other for complex performance logic.

UI Design
• WoodPecker – Modular grid with parameter randomization and per-step visualization.
• Quantum – 16 vertical faders per page, color-coded selections, and multi-page sub-panels for actions, transposition, parts, and MIDI.

Editing Controls
• WoodPecker – Swipe edit, randomize, probability, pattern variation.
• Quantum – Draw mode, linked faders, selection sets, incremental adjustments, and value limit scaling.

Step Mute / Skip
• WoodPecker – Per-step mute or skip buttons affecting loop timing.
• Quantum – Mute and skip buttons added in v1.6; skips can shorten sequences dynamically.

Humanization
• WoodPecker – Per-step humanize probability.
• Quantum – Humanise % controlling random timing and velocity variation.