You must use the Genos onboard, USB, Audio recorder/player to play them. They should work just fine.
Press the USB Audio Player button, then tab to the USB drive to select the file you wish to play, and press the play button at the bottom of the display.
Hope this helps,
Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)