Zoom H4n Pro Operation Manual page 79

In 4CH mode you can select the input source for the tuner.
4
5
When pitch is low
When pitch is high
No input sound (chromatic)
This cannot be used during recording and playback.
4CH mode only
String number/note name
Tuner type
1 2 3 4 5
GUITAR E B G D A
BASS G D A E B
OPEN A E C# A E A
OPEN D D A F# D A
OPEN E E B G# E B
OPEN G D B G D G
DADGAD D A G D A
6 7
E B
E
D
E
D
D
078