“Paul stretch” (free) will do the aaaaaah eeeee stuff: example by moi here … https://forum.audacityteam.org/t/empty-void-endless-abyss-echo-effect/15519/11
“Paul stretch” also has a freeze option which makes the sound go on indefinitely rather than just stretched.
Audacity has “change tempo without changing pitch”, which in principle is the same as Paul stretch, but in practice it has more artifacts when taken to extremes, (and won’t do freeze).