How to extend Jazz Modes and Scales:
Going back to our negative harmony web page CLICK we had a scale extension of Ionian and Phrygian.
Employing our old friends “Tetrachords” we can build complete 2 octave scales when the octave [or repeated starting note] is missed. In this case the whole tone scale and its transposition builds the scale extension.
TETRACHORD SCALE
We can also build 2 octave scales by joining together two “One octave” scales.