More research: The MO6x does not have a card slot. The MO6xf does, as well as the XF series. Exchanging mine because I got the XF expansion card and pen drive today (I had no idea I was to receive a bonus gift!)
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Live: Korg PA4X/Zed 6FX/EV Everse 8s/Senn 935/K&M stand
Studio: Korg PA4X/Yamaha DGX670/Yamaha PSR SX900/Boss BR900CD/Tascam DP24SD/MTM Iloud/Senn 935/K&M stand/Shure SM57/Sony C80 (2)/Blue Encore 300