This script will incrementally number your choice of the Track Number, Episode Number, Episode ID tags, and track Name prefix of the selected tracks. Additionally, a Track Count can be applied to each track, Episode ID can be configured with additional text incorporating the number, and zero-padding up to three digits can be applied. (The selected tracks must be sorted by ascending Play Order for accurate results.)
OS X 10.6 and better only.
Apply incremented numbers to the appropriately sorted track selection.