Try http://www.sweetwater.com/ in Ft Wayne Indiana.  They are
very knowledgeable.  You should be able to hook a board
to one of the output ports on your laptop.  I have seen it done.

You might lso might try Woodwind and Brasswind in South Bend IN:
http://www.wwandbw.com/

Both of these stores are heavy into computer technology as it apples to
musical applications.

Good Luck

Dick Day
Marshall MI