The Usb port is available to transfer data from the computer to the SD or MMC card or vice versa(the only storage unit apart from the internal memory). You can also use this connector as a MIDI port. You can't use a Usb flash drive as far as I know.

[This message has been edited by vagro (edited 07-30-2008).]
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Victor

Korg Pa3x 61 - Mediastation X76 - Yamaha Psr s900 - Korg Tr61 - Roland PK5A - NanoKontrol - Ensoniq SQ1 - Yamaha D85 organ