Tune your trombone with your microphone. The tenor and bass trombone read music at concert pitch in bass clef, so the note shown is the note that sounds.
Press Start tuning, then play or sing a note
Detected note
Concert pitch
Set the main tuning slide first. Play a note in first position and adjust until the needle is in the centre. Pull the tuning slide out to lower the pitch, or push it in to raise it.
After that, playing in tune depends on your slide arm. Play through the positions and watch the needle to learn exactly where each note is. The positions get further apart as you move the slide out.
On the trombone, playing in tune depends on your slide arm. The needle shows exactly where each note is in each position.
Set the main tuning slide using a note in first position. Then play through the positions and adjust the slide until each note is green.
Not in bass and tenor clef, where it reads at concert pitch. Brass band parts in treble clef are written in B♭, so use the B♭ setting for those.
Bands usually tune to concert B♭ in first position, and orchestras tune to A.
Each harmonic has its own natural tuning. So some notes need the slide a little in or out from the usual position. The tuner shows you how far.