Reply to Laser guitar

Hey guys,

One week ago a friend of mine and i watched the vid of ean's preformance with the guitar hero guitar. We tought is was very cool but it needed a mod. We started believeing and came up with this:



The idea was that interupting a laser worked the same as pushing a button.

Today we finished al the believeing and we had al the parts in our basket, but then we realized it is a cool, but toaly useles design cause it's very unpractical.
Don't really know why i'm showing this, maybe cuz i hope someone has an idea of how to make it work, lookin cool and practical. Otherwise i'll stick with the original design