If you are using DMD Remote by cable the system does not work like an HID keyboard.
You probably wont be able to use Key Mappers.
For cable connection, the support for our controllers should added by the app developer, preferably using our implementation example:
https://github.com/johnkeel-thork/DMD-For-Devs/blob/main/ControllerExample.java
DMD2 Project Manager & Lead Developer
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