Roland AIRA Compact E-4 Voice Tweaker - Manual (Page 13)

Adding Harmonies (HARMONY)
13
Setting the harmony key and scale (KEY, SCALE)
1. Move the [PITCH] slider while holding down the [HARMONY] button.
Value Explanation
A N
(Am)–
AbN
(Abm)
Sets the minor scale of the key you select.
ChrN (Chromatic)
Creates harmonies based on chromatic scale steps in fixed proportions, which are independent of the key
or scale.
A
(A)–
Ab
(Ab) Sets the major scale of the key you select.