[Ustad Khan Ali]

Approaching this, I would probably suggest doing several passes on all the melodic vocal parts, and then doing several passes on all the screaming parts, and then comp them together. I don't like doing things line by line because it often ruins the continuity, as you might well imagine. I'd rather comp them together, using one track that has the best overall performance, and then slipping the other takes in here and there to make it sound really good and cohesive.

I might do some doubling after we've decided what are the keeper tracks. Panning - depends on the song.

I usually don't double vocals, but sometimes if I do, it'll be the choruses or certain section for effects.

I don't use Autotune. If they can't sing the part, then they need to change their part or get it right or get another singer or get singing lessons or whatever.