I was watching a Christopher S. lesson....he was discussing the minor pentatonic scale and I was right there with him. Then he mentioned adding back in 2 more notes to make it diatonic. Still with him. Then he said to add in those notes here or there to create a modal sound such as Dorian, Phrygian I think etc. Flatting or sharping certain notes to create the particular modal sound. I thought the modes were basically about scales just played from a different starting points, so I fell of the track there. Christopher or anyone?