Noob question - which voice sample to use?

[cryptotester]

Hi, I found RVC models on voice-models.com, e.g.Trump, Obama etc I mean you name it, many RVC models of many influencers and famous people can be found online.

I downloaded the file, renamed the index to match the model. Tried to use it. Got an error which didn't help much but somehow I guessed I had to provide also a voice sample...

Why a voice sample is needed? I spent a bunch of time to find some trump voice sample and I'm not even sure if this helps to use the Trump RVC model...

What kind of a voice model should I use? I guess it depends on the RVC model, right? So I don't really need a sample of trump voice to use the trump RVC model, or if I find it, it actually helps?

For best results, how long should the voice sample be, how many words? Quality?

This is worth to add in the readme (that a voice sample is mandatory) maybe provide one already, so people can start using this repo immediately?

Also, what is the index rate for? By default it's 0.75, what is it supposed to do if we use a higher or lower value?

Thanks for anyone who can clarify these things. So far this repo looks very promising, thanks for creating it.