Recently there was a thread about converting a Bb cornet to C, and there was some controversy about this. But I have often wondered: Pic's often have a different lead pipe to allow either Bb or A, why would not a trumpet have different slides (a full set to make the horn in tune with itself) to make it interchangeable from one pitch to another (most obviously Bb to C). I know there are interchangeable bells, but some (most?) of the posts I have read about this seem to indicate the preference for having a dedicated horn(s). This, obviously, can become a very expensive venture. I'd love to have a cornet in the future, and a C horn as well. Wouldn't it be nice to be able to have one horn . . . Kanstul makes both a Bb and C cornet, but it appears as if the wrapping is different (maybe the british style comes close to the C Cornet). Cornets Please educate me - is it just about bell length - or has it just not turned out very well when tried in the past?