Feed in a melody. See multiple ways to finger it — efficient, legato, pedagogical.
press play — the valves move through your line
feed in a melody (written)
7 notes · type names, or hum a line above
8 valve moves · 2 lip slurs
fingering
C'
open
E'
1+2
G'
open
C''
open
slur
G'
open
slur
E'
1+2
C'
open
Same notes, three ways to finger them. Efficient keeps the valves quiet; legato hunts for lip slurs so the line connects. There's rarely one right fingering — there's the one that serves the music.