Korg TM-70T Owner's Manual page 7

Tuning while checking the pitch (Sound-Back)
The Sound-Back feature outputs the reference tone that's
closest to the tone you're playing on your instrument
(the input tone).
This is handy when you want to check whether the note
you're playing is out of tune with the reference pitch and
in other situations.
You can use this when either or both of the
jacks are being used.
1. Long-press the
appears on the display.
2.
Input your instrument's sound via a
contact mic plugged into the
or via the built-in mic.
A reference tone is output from the headphones or
speaker.
When using the built-in mic, connect only to the
jack, not the
3.
Tune your instrument using the reference tone and
meter.
4.
To turn sound-back off, press the
Tuning using the Transpose function
Use the Transpose function on this device to conve-
niently tune to instruments with movable pitch (such as
brass and wind instruments like trumpets and saxo-
phones).
1.
Press the
The reference pitch changes as follows.
F  B ♭  E ♭  C  F ...
The reference pitch you
selected appears on the display
( ,
shown when the reference
pitch is C.
2.
While playing a single note on your instrument, tune
it so that the meter lines up with the
the center.
1, 4
jack.
1
button to select the reference pitch.
, ). This isn't
button while the tuner is on.
jack,
5
and
button.
indication at