NTT means Note Transposition Tables. This setting is used to tell the arranger how to generate chords in tracks when a chord which is not the one in the original recording, is detected.
When the style is created, the notes in the tracks will be based on one key and chord. C Maj is the default key and chord for the tracks. But while the style is played, the arranger will generate all the chords detected on it by transposing the notes in the original recording of the tracks. This transposition works based on the settings in NTT.
NTT has two sections. They are NTT Type and NTT Table. The later is a sub section of NTT type.
NTT Type has two options in it. “Parallel” and “Fixed”. “Parallel” will keep the same inversion of the chord as in the original recording, when transposed to a different chord. But in “Fixed”, the inversions of the new chords are formed to find the closest position from the original recorded chord.
For example, original recording is in C Major root position (C, E & G). With “Parallel” NTT Type, when F major is selected, it will play F major in root position (F, A & C). If the setting is “Fixed”, it would play F major in the second inversion (C, F & A) which is the closest position from C Major.
When parallel NTT Type is selected, there would be 4 options in NTT Table.
1. Root (This will transpose the root note of the original chord if the new chord needs an additional note. For eg: original is a major chord and the new chord is 7th)
2. Fifth (This will use the 5th of the original chord to form the new chord. If C Major is the original chord, G which is the fifth of C Major, will be used to generate the new chord)
3. I Series (This is used to load the old i Series arranger styles. It needs the original chord to be a Major 7th or Minor 7th)
4. No Transpose (With this setting, the original chord type is not changed. But key will be transposed. So when the original chord is C Major, even when a C minor, C diminished or C 7th chord is selected, it will play C Major chord. But if F Major is selected, it will play F major. For F minor, Fsus2 or F 6th etc, F Major will be played)
When Fixed NTT Type is selected, NTT Table has two options in it.
1. Chord (With this option, the chords are generated by forming the inversions of the new chord, which are close to the original chord’s position)
2. No Transpose (While this is selected, no transpose will be done from the original chord. Irrespective of the chord and key detected on the arranger, the original recorded chord will be played always)
Watch this video for more details on NTT