Synth Multisampler for OP-XY

Generate multisamples for OP-XY using 8 different synthesis engines for maximum sonic variety.

Features

• 8 Synthesis Engines:

  • Modal Synthesis: Vibrating structures, resonant modes
  • Resonant: Bandpass filters at harmonic frequencies for bell/vocal tones
  • Sympathetic Strings: Comb filters for sitar/harp-like resonance
  • Plucked String: Karplus-Strong algorithm
  • Blown Pipe: Waveguide physical model for flutes/brass
  • 2-Op FM: Frequency modulation for metallic/bell tones
  • Additive: Pure harmonic synthesis for organ-like sounds
  • Filtered Noise: Bandpass filtered noise for wind/breath sounds

• Universal Parameters (meaning varies by engine):

  • Structure:
    • Modal: Harmonic spacing, inharmonicity
    • Resonant: Number of resonators (3-8), harmonic spacing
    • Sympathetic Strings: String detuning spread
    • Plucked String: Inharmonicity, string stiffness
    • FM: Modulation index (0-20)
    • Additive: Odd vs even harmonics
    • Noise: Number of bandpass filters
    • Waveguide: Breath noise amount
  • Brightness: High frequency content, filter cutoff, harmonic rolloff
  • Damping: Decay time, resonance, feedback amount
  • Position: Excitation location, formant spacing, phase offset

• Modulation (LFO):

  • LFO Destination: Modulate Structure, Brightness, Damping, Position, or Pitch
  • LFO Waveform: Sine, Triangle, Square, or Random (Sample & Hold)
  • LFO Rate: 0.1 - 20 Hz
  • LFO Depth: Modulation intensity (0-100%)
  • Adds movement and organic character to sounds

• Envelope & Excitation Controls:

  • ADSR Envelope: Attack, Decay, Sustain, Release
  • Excitation Type: Impulse (strike), Noise burst, or Harmonic (pitched)
  • Excitation Intensity: Control the strength of the initial excitation

• Smart Randomization:

  • Pluck: Instant attack, bright, natural decay (guitar, bass, pizzicato)
  • Strings: Smooth attack, sustained, expressive (bowed, violin, cello)
  • Pad: Very slow attack, atmospheric, very long decay
  • Lead: Bright, articulate, fast attack, punchy
  • Bass: Dark, deep, fast attack, long sustain
  • SFX: Experimental, fully randomized all parameters

• Export Format:

  • OP-XY (.preset with individual WAVs + patch.json v4)
  • Automatic silence trimming (-60dB threshold)
  • 16-bit PCM WAV files optimized for OP-XY

• Features:

  • On-screen MIDI keyboard for previewing notes
  • Preview sounds before exporting
  • Configurable MIDI note range and increment
  • Smart key mapping with velocity layers

Quick Start

Local Development

# Start local server (from rings-multisampler directory)
npx http-server -p 8080

# Or use Python
python3 -m http.server 8080

Then open http://localhost:8080/rings.html in your browser.

Engine Guide

Best Uses for Each Engine

• Modal: Bells, metallic percussion, mallet instruments, pitched percussion
• Resonant: Bells, chimes, vocal formants, tuned resonators, crystal sounds
• Sympathetic Strings: Sitar, harp, tanpura, shimmering string resonance
• Plucked String: Guitar, bass, banjo, pizzicato strings
• Blown Pipe: Flute, recorder, pan pipes, brass, woodwinds
• 2-Op FM: Electric pianos, bells, metallic leads, DX-style sounds
• Additive: Organs, drawbar sounds, pure tones, electronic pads
• Filtered Noise: Wind sounds, breath, ocean waves, air textures, vowels

Usage

1. Adjust Parameters

   • Select synthesis engine from dropdown (8 engines organized by type)
   • Choose a sound type (Pluck, Strings, Pad, Lead, Bass, or SFX) and click "Randomize" for instant parameter generation
   • OR manually adjust structure, brightness, damping, position, envelope, and LFO controls
   • Use the on-screen keyboard to preview different notes
   • Click "Preview Sound" to hear middle C

2. Configure Export

   • Set preset name
   • Set key-on duration (default 3000ms)
   • Configure MIDI note range (default C2-C6 in semitone steps)

3. Download

   • Click "Download Multisample"
   • Generates .preset.zip ready to load into OP-XY
   • Includes trimmed 16-bit WAV files + patch.json

Technical Details

Synthesis Engines

Physical Models:

• Modal Synthesis: 8 resonant modes with exponential decay, configurable harmonic spacing
• Resonant: 3-8 bandpass filters at harmonic frequencies with formant-like positioning
• Sympathetic Strings: 5 detuned comb filters with averaging filter and feedback control
• Plucked String: Karplus-Strong with delay line, filtering, and inharmonicity
• Blown Pipe: Waveguide with breath noise and reflection coefficients

Spectral:

• 2-Op FM: Classic frequency modulation with time-varying modulation index
• Additive: 16 harmonics with individual control over amplitude and phase
• Filtered Noise: White noise through multiple bandpass filters (1-5 formants)

Output Specifications

• Sample Rate: AudioContext sample rate (typically 44.1kHz or 48kHz)
• Bit Depth: 32-bit float (internal synthesis) → 16-bit PCM (export)
• Format: Mono WAV files
• Silence trimming: -60dB threshold
• OP-XY patch.json format: v4 with regions, key mapping, loop points

Credits

• Modal synthesis inspired by Mutable Instruments Rings (Emilie Gillet)
• Synthesis engine implementations by Chad Furrow
• Export code adapted from tv7-js DX7 tool

License

MIT License

Links

• Mutable Instruments Rings Documentation
• Mutable Instruments Eurorack Source Code
• DX7 Multisampler Tool