Click any note from Low F♯3 to High C6 to see valve combinations, hear the reference pitch, and check acoustic intonation tendencies.
A trumpet is an acoustic amplifier with 7 tubing lengths. Select any valve combination below to highlight its natural overtone series (Partials 2, 3, 4, 5, 6, and 8) and hear the bugle slots arpeggiated.
The standard B♭ trumpet is a transposing instrument pitched one whole step (2 semitones) below concert pitch. When you read and play a written Middle C (C4, Open), the instrument produces a concert B♭3 (233.08 Hz). When tuning to an orchestra oboe or piano playing Concert A4 (440 Hz), a B♭ trumpet player fingers written B4 (2nd valve). On a C trumpet—commonly used in symphony orchestras—written pitch equals concert pitch.
Each valve adds tubing calculated for the open bugle alone: the 2nd valve lowers pitch by 1 semitone (~6% length), the 1st valve by 2 semitones (~12.2%), and the 3rd valve by 3 semitones (~18.9%). When you press 1+3 (for D4) or 1+2+3 (for C♯4), the air column is already lengthened by the 1st valve, so the 3rd valve tubing is proportionally too short. Extending the 3rd valve ring slide by 1.5–2.5 cm restores exact intonation.
Three pistons create 2³ = 8 combinations, and because 1+2 and 3 alone produce the same 3-semitone drop, the trumpet operates as 7 distinct bugles descending chromatically from Open (0) to 1+2+3 (-6 semitones). Every note on the instrument is played by selecting one of these 7 tubing lengths and vibrating the lips at the 2nd, 3rd, 4th, 5th, 6th, or 8th harmonic partial.