HELP!!

A quick question. I’m working with band in a box and have quite a few arrangements ready, however now I have to put the lead melody line in with my fr3x.
1) Can I midi from my 3x to my computer via a midi usb cable? OR
2) Do I need to use an audo interface - (ACCORDION TO INTERFACE THEN USB CABLE TO COMPUTER?)the accordion does have Midi in/out.

3) Or is there a better solution??

I would appreciate any info.
Thanx
Gary