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Headphone amp, should be in tracking or control room?

As different vocalist needs different headphone volume/reverb while tracking,
are these parameter can be changed by the vocalist in tracking room by putting some gears(like headphone amp, mixer...) in it?
Or these should be controlled by the engineer in control room?

If by the vocalist,
what equipment should I need to do this purpose?

Insolating a room

I was woundering if you guys had any tips on insolating a room? It would be in a home for vocal's and electric guitar. Again, it's in my home so it's not really made for recording.
What is the size of room that's tot small or too big?

I would be using a Nuemann U57, and it would be pop rock kind of sound.

Thank you very much.