Found a couple of Roberts discographies. One lists "Theme From Shaft", with a note that howard wasn't credited, but the belief is, it was him. I'd heard that the "Shaft Guitar Man" was Roberts for years and read it several places, but it may not be true. I'm going to look a little longer this week-end. Always thought it was not exactly Roberts style, but he was a major session player, with over 2,000 credits.
I've run into conflicting info before on certain playing credits. Sometimes players did not get credit. Other times, the infor was just wrong.
I'm really curious about this one!
R.