What is the difference between a definite and indefinite pitched instrument?

Answer 1

A definite pitched instrument produces sound at fixed frequencies that are constant at each position or setting. Example: a piano is a definite pitched instrament. When you press Middle C on the Keyboard the same tone occurs every time. "Digital sound is another example"

Where a indefinate pitched instrument is linear or analog in that there is no specific separation between notes. Trombones are a great example, because the slide allows the instrument to not only play a clear precise note such a Middle C, you can plan an near infinate numbers of tones between Middle C and C sharp by minute changes in the position of the slide.

Another way to look at it is, stairs versus ramps. You go up and down stair in measured amounts, no stopping between steps. A ramp has infinite points you can stop and start from.

Hope this helps.