Interesting. Thanks Brad!
I'll get you some test files on the plug-ins (and HW) as soon as time permits. I'm curious to see if any of them modeled the dynamic HF response.
As an aside - I got my first-ever reel of 1/2" SM911 yesterday. Interestingly, with both 911 and ATR tape I get a flatter high end than with 456 or 499. -2dB instead of -3dB at 20k, -0.9dB instead of -1.2dB at 16k. Flatter through the mids too.
I tried 2 reels of "one-pass" 499 from Tape Tape. Both were badly worn out - trying to align at 10k was like chasing a pea around a dinner plate with a dull fork. One pass my a$$!
So glad they're making quality tape these days!