Any way to replace the existing voice audio with new audio?

This story is from 2026-09-04. It is preserved in the archive; the latest stories are on the live feed.

So i tried a pass to extract the existing vocals from minimax h3 out using demucs and then run it through index tts but couldnt get the it to align and lip sync. Any one know a better way to do it with success? Using refva lightx lora and nvidia vsr for upscale.