Vel on Nostr: I've used the podcast speech enhance ML service from Adobe previously, are there good ...

I've used the podcast speech enhance ML service from Adobe previously, are there good free alternatives?
There seem to be a few projects on GitHub but if anyone has experiences with this topic I'd love to hear them ​​
I'm trying to enhance an audio book (in german) that has been recorded by a private individual and uploaded to YouTube in 240p ​​