🥁 orDrumbox: Free Online Drum Machine & Sequencer

orDrumbox is a comprehensive web-based rhythm workstation and step sequencer. Entirely free and open-source, it allows you to design and program complex musical loops using acoustic, vintage, or 8-bit kits directly in your browser without any prior software installation.

Official Documentation & Resources

🚀 Core Features Overview

🎹 Advanced Step Sequencer (Pattern Panel)

• Interactive Grid: Click to easily add or remove notes, featuring cell opacity proportional to note velocity.
• Polyrhythm Support: Configure the number of steps per bar (1 to 8) and bars per pattern (1 to 8) independently for each track row.
• Custom Loop Points: Adjust individual track loop end points to create evolving and complex rhythmic offsets.
• Precise Swing: Apply a shuffle coefficient (0 to 1) on odd-numbered steps to humanize your grooves.

🔊 Virtual Synthesizer (Soft Synth) & Modulations

• 3-VCO Architecture: Generate your own custom sounds (square, sawtooth, triangle, or sine waves) with individual controls for gain, octave, and fine detuning in cents.
• ADSR Envelope & Filters: Adjust Attack, Decay, Sustain, and Release times, and route signals through an integrated biquad filter (lowpass, highpass, bandpass, etc.).
• LFO Modulators: Map independent sine-wave LFOs to volume (Velo), panning (Pan), Pitch, or filter cutoff frequency to inject movement into your beats.
• AI Generation (Auto Gen): Instantly generate coherent basslines and rhythmic drum patterns matching appropriate musical genres.

🎛️ Per-Track Effects & Master Mixing Console

• Dedicated Signal Chain: Activate an individual Saturation/Distortion unit (soft, hard, tape), a Reverb processor (room, hall, plate, spring, gated), and a stereo Delay (slap, tape, pingpong) on each track.
• Master Effects Section: Polish your final mix using a shared master compressor (Threshold, Ratio, Attack, Release, Knee) and Master Low-Cut and High-Cut filters.
• Spectrum Analyzer: Monitor your track frequencies in real time via a highly responsive built-in visualizer.

🛠 Getting Started & Studio Integration

Keyboard Controls & MIDI Hardware

Turn your computer keyboard into a live drum pad! Keys from Q to I are directly mapped to audition your tracks instantly. For more advanced setups, orDrumbox natively supports external MIDI hardware controllers following the General MIDI (GM) standard for real-time tracking and performance.

Data Management & File Exporting

• JSON Project Export: Save your patterns locally as compact project files that only store modified settings.
• Multi-Track MIDI Export: Export standard Type 1 MIDI files, making it easy to import your patterns into any DAW (Ableton, Logic, FL Studio, etc.).
• Studio WAV Rendering: Render high-quality audio files directly using the browser's integrated OfflineAudioContext.

Offline Performance (PWA Ready)

Leveraging its Progressive Web App architecture and built-in Service Worker, you can install orDrumbox directly on your desktop or mobile device. Once added to your home screen, the application remains fully functional without any internet connection.

🏗 Open Source Project

orDrumbox is maintained by the community under the GPL V3 License.

• GitHub Repository: github.com/cadeli/ordrumbox-v2
• Official Website: www.ordrumbox.com