Mikepaul wrote:but it's not possible that the material is immaterial since it is the instrument itself. If that were true, you should be able to get a nice tone out of cardboard.
Cardboard really isn't dense enough to work, I don't think.
But in all honesty, before I decided to spend money on lathes and stuff (big expenditures), and because it was late at night and home depot was closed, I *did* make a whistle out of construction paper and brass that didn't play great but made enough noise to prove up the concept of my build theory to me. It lived about 7 minutes before it wasn't playable due to moisture and stuff, but that was enough to leave me hopeful.
I think as thin-walled as a whistle is, any sufficiently dense material will be similar to any other sufficiently dense material. I've played brass and nickel-plated feadogs, brass and nickel copelands, Busmans of various materials (wood and delrin), brass nickel and composite burkes, and several woods of thin weasels. I'm pretty sure that the window and labium voicing had 99.999% to do with any changes in sound. When I lived in Houston, my brass copeland sounded identical to the nickel copleand that would also get played by another guy in session.
I've made whistles out of zebrawood, cherry, birdseye maple, purpleheart, pvc, and bubinga (in addition to that construction paper test whistle), and I think my voicing of the whistle is primarily what gives it the sound it has.
Really, get whatever material turns you on, and you can choose to believe the material makes a big difference, but I don't.