The Yamaha DGX-505 uses the Yamaha USB-MIDI Driver to communicate with a Mac. Selecting the correct driver version is essential, as it depends entirely on your specific macOS version and processor type. Yamaha Corporation Choosing the Correct Driver
The Yamaha DGX 505 uses two types of connections: Yamaha Dgx 505 Midi Driver For Mac
When you search for "Yamaha Dgx 505 Midi Driver For Mac," you will find dozens of "driver download" websites. They are scams. Here is what they will give you: The Yamaha DGX-505 uses the Yamaha USB-MIDI Driver
For MIDI only , it’s solid. For file management , it’s a dead end on Mac. Skip hunting for a driver—you don’t need one, but you might need a USB 2.0 hub. it’s solid. For file management