This information is in the liner notes to LEE MORGAN - Unforgettable Lee! on Fresh Sounds Records.
Another interesting quote from Wayne is in the liner from Blakey & The Jazz Messengers' AFRICAINE; "Lee's approach to writing was fundamental. He was much more at home playing than writing, but he would never ask for help. That's one thing I dug about Lee - he would struggle through on his own. And then his innocence, his natural ability to communicate, really came through on 'Sidewinder.' He knew that if he was too deliberate, that if he was too tutored as a writer, that he would sound contrived. So he kept his shortcomings and learned to communicate in spite of them. Like Miles, he had the sound to overcome anything."