Roland VT-12 Owner's Manual page 14

Checking the Pitch
Changing the reference pitch
1.
Press the [ ] button and [ ] button simultaneously .
The display will indicate the current reference pitch.
2.
Use the [ ] [
Range: 415–465 Hz (default value: 440 Hz)
* If you do nothing for a predetermined amount of time, the indication of the reference pitch
will disappear, and the unit will automatically return to the pitch checking mode.
3.
Press the [ ] button and [ ] button simultaneously .
The indication of the reference pitch will disappear, and the unit will automatically return to the
pitch checking mode.
* During the playback of Preset tracks, the reference pitch is fixed at 440 Hz.
What is just intonation?
Just intonation is a method of tuning that ensures pure fifth and third intervals.
If you select just intonation, you'll need to specify the tonic (for a major scale this will be C)
that's appropriate for the key of your song.
The VT-12 will assign the lower of two voices as the tonic.
If a guide tone is sounding, the guide tone will be the tonic.
About pitches in just intonation
The VT-12 can detect just intonation pitches only in a major key.
If the guide tone is C, the pitches are calculated using the following ratios.
Equal temperament (cent)
Just intonation (cent)
Ratio
Equal temperament (cent)
Just intonation (cent)
Ratio
12
] buttons to specify the desired reference pitch .
C
0
0
1
F#
600
569
25/18
C# D D#
100 200 300
71 204 316
25/24 9/8 6/5
G G# A
700 800 900
702 773 884
3/2 25/16 5/3
E F
400 500
386 498
5/4 4/3
A# B
1000 1100
1018 1088
9/5 15/8