I just use mine like I used the hard disk on my KN6000 - to store modified styles, sounds and some of my favourite styles from earlier KNs. I also store complete Panel/memory/etc setups for individual songs or tunes.
I'm not really interested in putting mp3 or midi files on the card. If I want to play along with an mp3 or other audio, I just play the mp3 file or CD on my laptop, connect up the USB link and Voila! .....
Just another approach but probably not very practical for gigging, due to extra 'gear'
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Willum
After silence, that which comes nearest to expressing the inexpressible is Music.
Aldous Huxley
( especially when the music is played on a KN7000....)