Intro and outro: generate once, use forever
A podcast intro is 10–20 seconds: show name, one-line premise, host name. Generate it once with an announcer voice, save the WAV, and it's the same on episode 1 and episode 100 — no re-recording when you have a cold, no level mismatch between weeks. Write it as one block, put the outro (subscribe, review, next episode) as a second block after a blank line, and both come out as separate numbered files.