The Matinee Merry-Go-Round of course is long gone, but it existing briefly in 1945. It appears in radio schedules in newspapers in 1945. It's in December, October and September issues of the Daily Times. It's in a July issue of Broadcasting the same year. But in the 1947 Radio Annual we find out first clue. In a list of writers available for hire was Charles Hunter beside the call sign WJW and the program name "Matinee Merry-Go-Round." But a February 1946 issue of Broadcasting Magazine that this was also the return of Mr. Hunter. He had been serving in WWII with a tank unit. (ETO is an abbreviation for European Theater of Operations.)
So outside of about 2 years on WJW the nature of this program is unclear. But we do know a bit more about Charles Hunter. In 1941 he was just an announcer on WJW, and the June issue of Broadcasting announced that he had been drafted. It also noted that he was from Akron, OH. So his return in 1946 followed a 5 year military deployment. He was either hired as or promoted to Program Director. He was still in the role in March of 1950, but there was no sign of the Matinee.