Scooby Doo and Astro were just his main voices, but he was also the voices of..
Scrappy Doo, Bandit, Dr. Benton Quest, Bamm Bamm, Boo Boo, Ranger Smith, Snorky, Hampton, Atom Ant, Muttley, Ruff, Professor Gizmo, Uble-Uble, Pixie, Papa Smurf, Ricochet Rabbit, and Pop.