The Ear Training Lab

One of the six strings is slightly out of tune — either sharp or flat.

Click a note label to hear that string, or press Strum All Notes to hear them all in order, low to high.

Use the − and + buttons under the note you suspect to bring it back into tune, then press Check Tuning.

Toggle Repeat Notes on to keep replaying whichever note you last selected, every 4 seconds, until you turn it off.