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For live performance or critical studio work, abandon USB entirely.

However, your computer does not inherently speak "Yamaha." It needs a translator. That translator is the MIDI driver. Without the correct driver installed: yamaha psr s550 midi driver

Here’s the direct information you need: For live performance or critical studio work, abandon

Yamaha Psr S550 Midi Driver

For live performance or critical studio work, abandon USB entirely.

However, your computer does not inherently speak "Yamaha." It needs a translator. That translator is the MIDI driver. Without the correct driver installed:

Here’s the direct information you need: