A whistle with a moveable slider.
Beater: Hand and mouth.
The standard sound is a glissando, either up or down, or a wide vibrato. Individual pitches are theoretically possible (although very difficult) between A4 and C7.
Up and down
Blown imitation of locomotive whistle.
Sounds a tritone, and can be played with a deviation in pitch (characteristic of trains) or as a single sustained chord.
The Orchestra: A User's Manual is a free resource and will remain so. It still receives between 8,000 and 16,000 unique visits per month from all over the world. See the testimonials. Thanks to all the donations, I have been able to create this responsive re-design. But the movies and sound clips recorded in 2004 do show their age. I would really like to re-record everything and add many more techniques, especially for solo and ensemble writing. I estimate this will cost around £30,000. If you know a source of such funds, please contact me: a.hugill [at] bathspa.ac.uk