I had a great pretty long phone conversation with iZ Corp's Barry Henderson last week and he SWORE TO GOD that Pro Tools is not bit transparent (and the Radar's are), which I suspected all along. Like, according to Barry, recording into Pro Tools HD with an iZ ADA is a sonic compromise compared to recording into a Radar with the same converters!
I'm actually really happy with my PTHD system. Every time I work on it, I'm like, "Oh wow, I can do that? I couldn't do that working in Sampliitude." Pro Tools is just a really functional tool. But it's not bit transparent, and neither is Samplitude, Logic, or Digital Performer in my strong opinion/direct experience. ALL OF THESE DAW'S "sound" different, and you are free to call me a fool for saying that but I'm sticking to it.
THE WORST mistake engineers AND the music buying public made when digital recording hit the market was thinking a digital audio technology was somehow imbued with perfect transparency. I'm just pissed off that I lack the intellectual aptitude to understand why, specifically, one digital audio technology sounds different than another. I'm stuck with being a conspiracy theorist, and that's only fun when I'm stoned and paranoid.
Nicholas