Slide whistle

Is it this thing? … The PH-20 “Pipe Humming” harmonica? And does that endpiece actually move, or is it just an open tube?

http://www.suzukimusic.co.uk/harmonicas/diatonic.htm

Just tubular coverplates with one open end. Wah wah.

Just an open tube.
Suzuki Promaster, Hammond & Pipe Humming third part of the video
http://www.youtube.com/watch?v=rCchREHrEck

And then there is a Suzuki SCT-128 Tremolo Chromatic Harmonica
http://www.youtube.com/watch?v=GsJ0ZRye-HM&feature=related

Thanks, ID (and dwest)!

I guess at one time the slide saxophone was produced.

and a youtube video

That’s the one I was speaking of.

Sandy

Have you tried bugle calls to start with? It should have a minimum number of slide positions (I would think two, fully open and half in). From there you could try playing the same tune a note higher and get a feel for the slide positions.