Jerry,

I gather you have a background in fine arts? I spent a year or two studiying art, and that's where I became familiar with these instruments. I gave up on account of being barely better than mediocre and ended up an engineer.

I must say, though, that your (cross) thinking is very impressive. Even with the same information I didn't manage to make the jump and find the application.

Thanks, once more, for your insight.


Marcos