The miniDexed:

The miniDexed is an outstanding DIY synthesizer that brings the FM synthesis of the iconic Yamaha DX7 back to life in a compact, affordable, and flexible form. It combines powerful software, customizable hardware, and a passionate community to create the perfect tool for musicians, sound enthusiasts, and tech lovers.

1. Hardware: Modular and Efficient

The miniDexed is built on a flexible and accessible hardware design, allowing users to customize the project to their needs.

• Processing Power:
  The synthesizer uses a Raspberry Pi (models like Raspberry Pi 2, 3, 4, or Zero 2) as its main processor. This provides enough power to emulate up to eight independent DX7 tone generators.

• Audio Output:
  Audio is delivered through a high-quality I²S sound card or the Raspberry Pi’s built-in audio hardware.

• Controls:
  The miniDexed can be equipped with a display (e.g., OLED SSD1306 or LCD1602) and rotary encoders (KY-040) for easy operation. Alternatively, it can be controlled via MIDI controllers or buttons connected to the GPIO inputs.

• Power Supply and Case:
  The hardware only needs a USB power supply, making it portable and versatile. Many users design custom cases, ranging from simple and minimalist to professional-looking designs.

2. Performances: Sound Variety and Quality

The included performances of the miniDexed are a true highlight, showcasing the synthesizer’s rich sound variety and quality.

• Authentic FM Synthesis:
  The miniDexed uses the Dexed engine, an accurate recreation of the Yamaha DX7 sound generation. This allows it to use original DX7 presets, bringing the iconic FM sounds of the 80s into the modern era.

• Versatile Sounds:
  The performances cover a wide range of sounds, from classic electric pianos and punchy basses to lush pads, warm strings, drum-kitsand dynamic synth textures. With support for eight independent tone generators, you can create multitimbral arrangements for even complex music productions. 

• High Polyphony:
  Each of the eight tone generators supports up to 32 voices of polyphony (on Raspberry Pi 4 or higher), providing a total of up to 256 voices. This makes the miniDexed a powerful tool for orchestral arrangements and dense soundscapes.

3. Community: Collaboration and Innovation

The miniDexed community is a key part of the project, driving its development and innovation.

• Open-Source Software:
  The miniDexed software is completely open-source, allowing developers and users to add their own features and tailor the system to their needs.

• Active Forums and Platforms:
  Users share their experiences on platforms like GitHub, DIY forums, and social media groups. Here, you can find guides, hardware integration tips, sound presets, and many inspiring projects.

• Creative Projects:
  The community has developed numerous extensions and customizations, including unique cases, alternative control options, and integration into larger studio setups.

• Support and Knowledge Sharing:
  Beginners benefit from a helpful community that provides technical support and shares experiences to make it easier to explore the world of FM synthesis.

4. Conclusion: A DIY Masterpiece

The miniDexed is a brilliant example of how modern technology and creative DIY approaches can come together to create a powerful and inspiring instrument.

• For Musicians:
  It offers authentic FM sound generation with incredible flexibility and depth.

• For Tinkerers:
  The customizable hardware and open-source software make the miniDexed an exciting project for tech enthusiasts.

• For the Community:
  Active collaboration and idea-sharing ensure the miniDexed continues to grow and improve.

With its mix of advanced technology, rich sound variety, and a dedicated community, the miniDexed is a must-have tool for anyone passionate about FM synthesis and DIY projects.

DAW equipment:

For this project, I try to reduce the equipment to the bare essentials.  All sound Demos I show here were recorded with the following equipment:

• 1 miniPC with Celeron N5095 CPU + monitor + Windows 11

• Audio interface, Behringer UMC1820 (any other interface with a stereo line input will also work)

• DAW, Steinberg Cubase 12 LE (eBay approx. 12EUR)

• PlugIns free VST: Dexed, A1StereoControl(SafeBass), LoudMax, Cymatics - Origin, Voxengo SPAN (a great help in sound design)

• other Software: MIDI-OX, LibreOffice