I second the question.
I sat between a pair of them for the first time a couple of weeks ago on a new New Zealand 773ER, and noticed they were remarkably noisy when starting compared with the PW4000s or Trents that usually push me places, or what I recall from earlier model GE90s.
As I remember, it was an almost-constant-tone whine-grind noise, rather than a rising tone from something whose speed was increasing. I assumed it had to be from an air turbine, which didn't turn again for the rest of the flight after the engine started. I also see something perhaps similar has been discussed before at
http://www.pprune.org/fragrant-harbo...ml#post6008093