#4195 App: Synthesizer & Sequencer

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#4195 App: Synthesizer & Sequencer

#4195 Provide software application requirements for a music synthesizer and sequencer to be developed in HTML, JavaScript and CSS

Developing a music synthesizer and sequencer using web technologies is an ambitious and rewarding project. Since you're targeting the browser, the Web Audio API will be your engine, and Canvas or SVG will likely handle your visualization.

Here are the functional and non-functional requirements to get your development started.

1. Functional Requirements

Core Synthesis Engine

  • Oscillators: Support for multiple waveform types (Sine, Square, Sawtooth, Triangle).

  • Polyphony: The ability to play multiple notes simultaneously without voice stealing issues.

  • ADSR Envelope: A dedicated Attack, Decay, Sustain, and Release envelope for amplitude and filter cutoff.

  • Filter Section: At least one resonant Low-Pass Filter (LPF) with adjustable frequency and resonance (Q).

  • Effects Rack: Integrated Delay and Reverb modules to add spatial depth.

Sequencer & Timing

  • Step Sequencer: A grid-based interface (typically 16 steps) for triggering drum samples or synth notes.

  • Piano Roll: A vertical pitch axis for melodic sequencing.

  • BPM Control: Global tempo control with a range of 40 to 240 BPM, utilizing the AudioContext.currentTime for sample-accurate timing.

  • Transport Controls: Play, Stop, Record, and Loop functionality.

Audio Management

  • Master Volume: A final gain stage to prevent digital clipping.

  • Export Function: Ability to record the output and export it as a .wav or .webm file.

  • Preset System: Save and load user-created patches/patterns using localStorage.

2. User Interface (UI) Requirements

  • Responsive Layout: The CSS Grid/Flexbox layout should adapt to different screen sizes, ensuring knobs and sliders are touch-friendly.

  • Visual Feedback:

    • An Oscilloscope or Frequency Analyzer showing real-time waveforms.

    • Active step highlighting in the sequencer during playback.

  • Input Mapping: * Computer keyboard mapping (e.g., the "ASDF" row acting as white keys).

    • MIDI Device support via the Web MIDI API.

3. Technical & Non-Functional Requirements

Performance

  • Low Latency: Audio processing must happen in a way that minimizes the delay between a key press and sound output (aiming for <20ms).

  • Audio Worklets: Use AudioWorklet for custom signal processing to keep heavy calculations off the main UI thread.

Compatibility

  • Cross-Browser Support: Must function on Chromium-based browsers and Firefox (keeping in mind Safari's specific "user gesture" requirements to start audio contexts).

4. Suggested Data Structure

To keep your sequencer organized, you might model your patterns like this:

ComponentResponsibility
TrackContains an instrument instance and an array of steps.
StepContains pitch, velocity, and duration data.
ClockA lookahead scheduler that triggers events slightly before they occur.

Pro Tip: Browsers block audio from playing automatically. Ensure your UI includes a "Start Engine" or "Power" button to resume the AudioContext after a user gesture.

Would you like me to provide a boilerplate JavaScript code snippet to initialize the Web Audio API and a basic oscillator?


From <https://gemini.google.com/app/>  Google Gemini 3.0 (Fast)

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