I also was under the impression Gerry was a Baritone! I agree that his deeper voice is amazing, and is what I find very appealing. Yes, even when Gerry speaks (in POTO) he used the deeper voice, and it was very, very, effective!
POTO (Gerry as the Phantom) is my personal passion! Gerard Butler is the only actor who turned my head as far as his portrayal of the Phantom goes. I have seen the others on stage, but, as good as they were, sorry to say, none of them had the charisma of Gerry! None of them aroused my senses, took my breath away, and broke my heart! I love all of Andrew Lloyd Webber's musicals, and POTO was for me no different than Cats (which I also dearly love!). Gerry changed all that and set his Phantom apart from the rest, for me. You Ladies already know why....he was born to play Phantom, and, IMHO, he now owns him!
I don't have a "Love Letter" to share yet. Very difficult for me to put those emotions into words...just know that Gerry's performance and the magic of the movie has changed me forever.