Leaderboard

Trumpet players can bend notes to quarter tones yes. The further up in the harmonic series they are, the harder it gets. Pressing a valve down half way allows an easier bending, but the sound produced is similar to a buzzing sound. It isn't open.

I don't play any of those instruments but I'll tell you what I think, You can see here a few notes are not mechanical keys but holes you open/close with your finger, so I guess if you start half closing it you'll get a little gliss down, but I don't know what notes those holes are. Harp pedals can work fast just don't forget harpist have only 2 feet :D All trumpets have the tuning slide but you don't wanna move it while playing, you can move the slides in the -1 tone valve and -1 1/2 tune valve which are the "first valve tube" and "third valve tube" in this picture: not all notes can be played using one of these valves, for instance B natural would pressing the middle piston decreasing pitch in half a tone only, maybe real trumpetist know tricks for this but I don't see any other way to play a B natural than blowing C and pressing -1/2 valve (Trumpet players please help here) Some players I'm sure can do little glisses with embouchure, but it might not work in the entire range.