Thanks so much. The cables are good working order, working on other devices plus I have switched them out (I have a few of each type) I'm pressing function + D1 to toggle between the flash drive modes but nothing is showing up on my mac (in adobe audition, garage band, audio midi set up or Playground Sessions) I assumed it would be plug and play but it's extremely frustrating as I've been fiddling with it for 90 minutes now! Googling seems to show me that Macs and Casio are not friends with each other