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I will comment only on the subheadings of "Voice" and "Audio". They are both separate topics and also have things in common.
On "Voice", for spoken word announcements, a text-to-speech service is available which has been used by social media producers.
Illustrating with example:
This video uses a voice with a British accent named "Brian".
https://youtu.be/bU3wmKDtdio?si=nr0yKhGvs_ql5hfa
This text-to-speech website lets one type in text with "Brian" which is identical to the voice in the abovementioned video:
https://readloud.net/english/british/1-male-voice-brian.html
Adjustments can be made for pitch, speed and pauses in speech and the final product can be downloaded as an mp3 file.
In "Audio" noise reduction has been available in software for free for years. AI techniques are not needed to remove the noise. I've been able to remove noise, clicks and pops on vinyl and CD recordings using Nero WaveEditor which is available for free.
https://www.nero.com/eng/products/WaveEditor/?vlang=au
Any annoying popups from the program can be stopped.
When it comes to isolating voice and musical instruments from tracks even if the track is in mono, then AI/ statistical technique are employed.
There is a plethora of examples where singers sing tracks they have never sung to tunes they have sung and songs the artist has sung to new lyrics.
Example:
Flo' Rida's "Low" also known as "Apple Bottom Jeans".
Artist Luciano Pavarotti sings the lyrics of "Low" to the tune "Nessun Dorma"
https://youtu.be/YIZz2PMnEDM?si=qy0PU8XWYnJclRhW
Furthermore AI techniques can turn an orator into a singer.
Example: a business person and president sings "Fly Me To The Moon".
This example demonstrates the orchestral backing by Nelson Riddle has been isolated from the original recording sung by Frank Sinatra.
https://youtu.be/6VRKWa8FmKA?si=TL1fwGYcSLM2_6cm
The final example is a stereo version of the original mono recording of Strawberry Alarm Clock's "Incense and Peppermint".
https://youtu.be/TpCy2DNrhDY?si=VIsgPliobMTuFeYg
From the album "Hard To Find 45s on CD, Vol 17.
https://www.ericrecords.com/htf_17.html
Thank you
Anthony, Strathfield South, in the land of the Wangal and Darug Peoples of the Eora Nation.