Ethernet is the way to go in my opinion, IF your laptop has an ethernet connection (most have them built in these days..)

estimated costs;
el ceapo pc card $ 20,--
utp cat5 shielded cross over cable $ 6,--

cheap and fastest solution.
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Keyboards/Sound Units: Kurzweil 2600S, Roland VR-760, Acces Virus C, Roland G-800, Akai AX60, Minimoog, Machine Drum, Roland R8-M, mediastation x-76