Conversation so far:
What role did Povenmire play in Phineas and Ferb?
In 1993, Povenmire and Marsh conceived the series Phineas and Ferb, based on their similar experiences of childhood summers spent outdoors.
Was he a writer or illustrator on the show?
CANNOTANSWER.
What was his role on the show?
Povenmire then mixed and dubbed to produce action and vocals.

Question: How else was he involved in the show?
Self-contained rewrite: How else Dan Povenmire involved in Phineas and Ferb besides mixing and dubbing to produce action and vocals?