BombSeq 💣

VST3 MIDI sequencer with 64-step engine, MPC-style swing, and vintage hardware aesthetic.

Download

Pre-built VST3 binaries:

• macOS (Universal)
• Windows (x64)
• Linux (x64)

Installation

• macOS: Extract and copy BombSeq.vst3 to ~/Library/Audio/Plug-Ins/VST3/
• Windows: Extract and copy BombSeq.vst3 to C:\Program Files\Common Files\VST3\
• Linux: Extract and copy BombSeq.vst3 to ~/.vst3/

Features

Sequencer Engine

• 64-step MIDI sequencer with per-step parameters:
  • Note (pitch, 0-127)
  • Velocity (volume, 0-127)
  • Gate (note length, 0.0-1.0)
  • Probability (trigger chance, 0.0-1.0)
• Variable pattern length (1-64 steps) with visual feedback
• MPC-inspired swing/groove (50-100%, three grid modes: 16th, 8th, triplet)
• Sample-accurate timing with host sync
• Host tempo sync - automatically follows DAW tempo changes
• Step-1 fix - all steps trigger correctly with zero timing drift

Pattern Management

• 16 runtime pattern banks for quick switching
• 8 persistent user save slots with serialization
• Each pattern stores its own length and step data independently

User Interface (MPC60 Vintage Aesthetic)

• Grey/beige chassis with wood side panels
• 8×8 rubber pad grid with 3D raised rendering
• Amber LCD displays with vintage bezels
• Cream hardware buttons with red toggles
• BOMB branding in red (upper left)
• Step selection: Left-click selects (amber border), right-click toggles active/inactive (red)
• Pattern length feedback: Steps outside pattern length appear dark grey
• Clear parameter labels: "NOTE (PITCH)", "VELOCITY (VOLUME)", "GATE (LENGTH)", "PROBABILITY (%)"
• Real-time note name display: Shows selected step as "STEP 01: C4" with live updates

Technical

• MIDI FX plugin (appears in MIDI FX browser, not Instruments)
• Host transport integration - Play button + DAW transport both required
• Pattern persistence - Length and step data saved with project
• Cross-platform builds for macOS, Windows, Linux

Usage

1. Load in DAW: Add BombSeq as a MIDI FX device on a MIDI track
2. Activate steps: Right-click pads to toggle them red (active)
3. Edit steps: Left-click a pad to select it, adjust sliders on the right
4. Set pattern length: Adjust LENGTH slider (1-64 steps) - grey pads are outside pattern
5. Play: Press BombSeq's Play button + start DAW transport
6. Save patterns: Use SAVE buttons to store patterns, LOAD buttons to recall them

Build

cmake -B build
cmake --build build --config Release

Output:

• VST3: build/BombSeq_artefacts/Release/VST3/BombSeq.vst3
• Standalone: build/BombSeq_artefacts/Standalone/BombSeq.app
• AU (macOS): build/BombSeq_artefacts/Release/AU/BombSeq.component

Changelog

v1.2.0 (March 2, 2026)

• ✅ Host tempo sync - BPM display now shows DAW tempo (read-only)
• ✅ Pattern length control - LENGTH slider (1-64) with visual feedback
• ✅ Step labels above sliders - Clear amber labels for all parameters
• ✅ Grey-out inactive steps - Steps beyond pattern length appear dark grey
• ✅ Fixed step-1 trigger bug - All steps now trigger correctly
• ✅ Fixed timing drift - Sample-accurate sync with host PPQ
• ✅ Fixed note name display - Updates in real-time when NOTE slider moves
• ✅ Increased window height - All UI elements visible (620px)

v1.1.0 (March 2, 2026)

• ✅ MPC60 vintage UI redesign - Complete aesthetic overhaul
• Grey/beige chassis, rubber pads, amber LCDs, wood accents
• BOMB branding and vintage color palette

v1.0.0 (March 2, 2026)

• Initial release with step selection, user save slots, and per-step editing

Tech Stack

• JUCE 8.x (fetched via CMake)
• C++20
• VST3 + Standalone + AU

License

MIT

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Developed with OpenClaw AI + GitHub Copilot