Tune a guitar or bass by ear or by microphone, in any tuning and any number of strings.
Microphone
Play one string at a time, close to the microphone, and let it ring.
Reading
E2
Play a string
Target: 82.4 Hz
Strings
Tap a string to hear its reference pitch. The nearest string is picked automatically. Turn this off to lock onto one string when it is badly out of tune.
Setup
Instrument
String count
Tuning
Reference A440 Hz
Concert pitch is A = 440 Hz. Change it to match an ensemble tuned sharp or flat.