I wasn't aware that before, but when I tried, it worked. Get any music from your PC and connect the audio out to the MIC in to the S900, regulate the volume checking on the mic/setting signal not to go red, and it's done. Mind you this process takes a lot of memory from your pen-drive. So you better have at least 2giga. I have already 40 music on the audio-usb. For those who like to play along mp3, it's great feature. Anyone interested, I can send you some of the music which I recorded into the pen-drive. They´re mostly new-age type. Cheers.Telmo.

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Yamaha PSR-SX900, Mackie SRM-flex Portable Column PA System)
Youtube: https://www.youtube.com/@telmogama/videos
"We are Old too quick... and Wise too late."