Well here we are.
A neat gallery of the details of the light harp. Click on a picture for descriptions.
By the way:
Schematics
Source code w/executables (delphi)
All sound including the feedbacker effect is generated with Propellerhead Reason 4. I will upload the reason patch on request.
neo-norwegian experiments in art and technology 
Your work on interactive art is very impressive, and thanks for sharing your knowledge. It will take me some time to read all these very interesting ideas and stuff. Thanks.