DX7 to OP-XY / Tonverk Multisample Patch Maker

Convert DX7 SYSEX patches to multisamples for OP-XY or Elektron Tonverk.

Forked from spacejam/tv7-js with added OP-XY support and retro 80s DX7 aesthetic.

Features

• 🎹 Load DX7 SYSEX bank files (.syx)
• 🎵 Generate multisamples across any MIDI note range
• 🎛️ Preview patches with on-screen keyboard
• 📦 Export to two formats:
  • OP-XY (.preset with individual WAVs + patch.json) - Default
  • Elektron Tonverk (.elmulti + concatenated WAV)
• 🔊 Includes 50+ example DX7 patch banks
• 🎨 Classic 80s DX7 interface with teal LCD-style display

Quick Start

Online (Easiest)

Visit the hosted version at: https://cfurrow7.github.io/dx7-opxy/tv7.html

Local Development

# Clone the repository
git clone https://github.com/cfurrow7/dx7-opxy.git
cd dx7-opxy

# Install dependencies
npm install

# Start local server
npm start

Then open http://localhost:8080/tv7.html in your browser.

Usage

1. Load a DX7 Bank

   • Upload your own .syx file, or
   • Select from 50+ included example banks, or
   • Click "Where to Find DX7 Patches" to discover thousands of free patches online

2. Select a Patch

   • Click any patch from the list
   • The output name will auto-populate as "DX7 [PatchName]"

3. Configure Parameters

   • Output Format: Choose Tonverk or OP-XY
   • Key-On Duration: How long to hold each note (default: 2000ms)
   • MIDI Note Range: Min/Max notes and increment
   • Preview notes using the on-screen keyboard

4. Download

   • Click "Download Multisample"
   • Tonverk: Generates a .zip with .elmulti + .wav
   • OP-XY: Generates a .preset.zip ready to load

OP-XY Format

The OP-XY export creates a .preset folder containing:

• Individual WAV files for each sampled note (16-bit PCM)
• Automatic silence trimming (-60dB threshold) for tight, clean samples
• patch.json with proper OP-XY v4 format specifications:
  • MIDI key mapping with velocity layers
  • Loop points and crossfade settings
  • Envelope, LFO, and FX parameters
  • Region mapping across the keyboard

Example Patches Included

• Tyler's Favorites
• Legowelt Magic DX7 Cart
• Rhodes, Wurlitzer, Clavinets
• ROM Banks 1A-4B
• PPG Vocal, Deckard
• And 40+ more!

Finding DX7 Patches

The tool includes a built-in resources panel with links to the best DX7 patch archives:

• DX7 SYSEX Archive - Thousands of organized patches
• Bobby Blues DX7 - Curated high-quality sounds
• Aberdeen Archive - Original factory ROMs
• Patch Base - Modern patch librarian

Simply download .syx files and upload them using the file picker!

Technical Details

DX7 Synthesis Engine

• Pure JavaScript implementation
• Based on Mutable Instruments Plaits DX7/FM engine
• 6 operators, 32 algorithms
• Envelope and LFO modulation
• Normalized to 0.5 dBFS for polyphonic stacking

Output Specifications

• Sample Rate: 44.1kHz
• Bit Depth: 32-bit float (internal) → 16-bit PCM (export)
• Format: Mono WAV files
• Automatic silence trimming (OP-XY only): -60dB threshold removes leading/trailing silence

License

MIT License - see original spacejam/tv7-js for attribution.

Credits

• Original TV7 tool by Tyler Neely - Foundation for Tonverk export
• DX7 synthesis engine ported from Mutable Instruments Plaits
• OP-XY integration and 80s DX7 interface design by Chad Furrow

Links

• OP-XY Multisample Converter - Convert existing multisamples to OP-XY format
• Original TV7 Tool - Tonverk-only version
• DX7 SYSEX Patches - Large collection of DX7 patches