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How to record a keyboard to Garageband using PreSonus Audiobox VLS22?

Hello,
I need to record my keyboard sound into garage band. It is a Yamaha Portable Grand DGX-505. It has a micro usb port, a 1/4" output jack. I tried to get a mono 1/4"- split 1/4" audio cable. The cable was a "grounding cable". It didn't work. What do I need and how do I set it up in GB? I would like the sound to be the sound that I am hearing in my headphone. Is this possible?