One thing that isn't getting discussed in this headphones/mix thing is
the new world of DIY headphone mixing: if the artist has a 'more me'
box at their disposal, they can really mess things up and the engineer
won't be in the loop.

I was just working with a singer/songwriter who was singing and playing
at the same time, and had two elements at his control: guitar and voc,
right? By the end of the session he'd pushed the guitar up so far in
the phones that he was barely playing it, with almost more voc than
guitar in the guitar mics. Not a pretty sound.

--
John Etnier
Studio Dual
http://www.studiodual.com