In 1980 he produced the Chipmunks ' comeback album Chipmunk Punk for Bagdasarian Productions .
In 1980 he supplied the speaking voice of Simon and the singing voice of Theodore for that album , but his association with that group did not end there .
In 1980 he produced the Chipmunks ' comeback album Chipmunk Punk for Bagdasarian Productions , and supplied the speaking voice of Simon and the singing voice of Theodore for that album , but his association with that group did not end there .