Hello all, I'm putting together a laptop based effects rig for a less technical friend of mine. He has a violin and a second hand laptop, and I'm trying to find the cheapest solutions for control options. I stumbled across this little goody, and I was wondering if anyone had any experience.

An Atari foot controller...

and

An adaptor to USB.

If no one has tried it I'll likely be a guinea pig, and if so I'll update.