Ultra to imac what wire do I need

Since you don't provide detail I am assuming you want to use your iMac to program, backup, and update firmware on the Axe-FX. If so, you need a USB to MIDI interface and two MIDI cables.
 
Agreed. The M-audio MIDI interfaces work instantly. I have a MIDISPORT 4 x 4 that was total plug and play.
 
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