genMDM editor is a GUI for genMDM, a MIDI controller for the Sega Mega Drive and Genesis.
Also fully compatible with Mega Drive MIDI Interface.

genMDM Editor is a desktop executable and a webpage.

The webpage works in Chromuim based browsers. Those browsers include Google Chrome, Opera, Brave and Microsoft Edge.

Using genMDM on iOS/iPadOS is possible using Web MIDI Browser, found here: apps.apple.com/app/web-midi-browser

genMDM Editor is compatible with both the genMDM, by little-scale, and the MDMI (Mega Drive MIDI Interface), by Robert Hargreaves. This Readme will refer to both interfaces as "your Sega", for convinience.

Check out the overview video on how to use the editor: youtu.be/btzQHaF8cU4

1. Download the latest release at genmdm-editor/releases/latest or navigate to 2xaa.github.io/genmdm-editor.
2. Select the MIDI device connected to your Sega in the MIDI Output dropdown.

If using MDMI, ensure the "MDMI Compatibility" option is turned on after connecting the MDMI.
The option sends a SysEx message to MDMI to invert the operator's Total Levels, as GenMDM does.

With the "MDMI Compatibility" option turned on, changing channels in the editor informs MDMI to show the channel's settings on the video output.
More information: mega-drive-midi-interface/wiki/UI-Features

The genMDM Editor was build around the .genm file format, which can hold 128 genMDM instruments.
Each instrument in the .genm file can store every parameter of the genMDM instrument.

The .genm format does not include any of the editor settings, the global settings or the DAC Control settings.

More information: little-scale.blogspot.com/genm-file-format

Pressing the "LOAD GENM" button will open a file browser to choose a .genm file to load.
Loading a .genm file will overwrite the current patches in the editor. It will not load anything to the current channel.

Pressing the "SAVE GENM" button will open a file browser to choose where to save a .genm file containing all the patches in the editor's patch list.

genMDM Editor can import and export .tfi, .dmp and .y12 formats using their corresponding "IMPORT" and "EXPORT" buttons.

The "IMPORT" buttons will open a file browser to load an instrument to the current channel - it does not write to the patch slot.

The "EXPORT" buttons will open a file browser to save the current channel's parameters to the selected instrument file format - it does not read from the patch slot.

This is a format for the genMDM Editor's internal state. It uses compress-json to serialise the internal state to a file. It contains the entire application state, including patches and editor settings.

Neither genMDM or MDMI save their session state when powered off, but genMDM Editor does.

genMDM Editor saves your editor state automatically, so if your Sega loses power, crashes, etc., your state can be restored by plugging in your Sega, selecting it in the MIDI Output dropdown and pressing the "Send State" button.

genMDM Editor's state can be saved to a file at any time by pressing the "Save State" button.

The .ged files can be loaded back into the editor with the "Load State" button. Loading a .ged file will overwrite the editor's autosaved state immediately.
If you want to sync this state to your Sega, press the "Send State" button.

genMDM does not support polyphony, though MDMI does the editor currently does not use this.

If "Polyphony Enable" is turned on, the "MIDI Input" device selected in the editor will have its notes spread over the output MIDI channels, starting from channel 1 up to the limit set by "Max Poly. Channels" (minimum 2, maximum 6).

When "Polyphony Enable" is turned on, changes to the instrument are copied automatically over the polyphony channels.

If you have any questions that aren't covered in the linked video, please start a discussion at genmdm-editor/discussions.

yarn

yarn serve

yarn build

yarn electron:serve

yarn electron:build

Contributions, issues and feature requests are welcome!

Feel free to check issues page.

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Consider sponsoring me on GitHub: https://github.com/sponsors/2xAA.

Copyright © 2021 2xAA.

This project is MIT licensed.