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I wired the eye lights into the brass eye sockets and am very happy with the results.
My sound system will consist of a CFSound 3(the 2 is no longer available) Board, and a small speaker. Voice and servo sound clips will be stored on the sound board and accessed via pressure switches mounted in the feet and hands.

The eyes will have three LED's for each eye, and they will be tied to a 9v battery in the back.
2006 R2-Depot

Images and sounds of R2-D2 and C3P0 are the trademarked property of Lucasfilm Ltd.