or do you mean a MIDI interface? If you mean midi interface (which I don't think you mean), The Midiman USB midisport 2x2 is very good inexpensive interface.
Midiman also make a serial and parallel midi interface, but with one in and one out.
In all these cases, an actual new card is not necessary.
Bob
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[This message has been edited by RW (edited 07-24-2003).]