Available in kit form... an 8 note portative instrument which plays using a "paper roll slider chest"
instead of keys and pallets.
http://www.marcle.co.uk/catap62.html (http://www.marcle.co.uk/catap62.html)
And yes, there is a Youtube video of a fully built instrument...
http://www.youtube.com/watch?v=3ahCihi-0sg (http://www.youtube.com/watch?v=3ahCihi-0sg)
Eric
KB7DQH
Bizarre. However, it does show all things are possible!
Jonathan
It is a cutie ;)