If I play a high level file and intentionally raise the Master Section faders so that the Master Section meters and the Level Meter are well into the red above 0db, I’m getting different results in the Level Meter depending on what dither plugin I then insert during this playback:
If I insert Internal Dither - no change in Level Meter (peaks still showing above 0db).
Izotope Dither - no change in Level Meter (peaks still showing above 0db).
UV22 - peaks above 0db are blocked in the Level Meter (as I expected for all three dither plugins).
If I then render all three of these to 32 bit float, the results are the same as they are in the Level Meter. (Internal dither and Izotope dither files have level peaks above 0db, but the UV22 file is brickwalled at 0, as i would expect in any normal fixed point renders.
Why are the Internal dither and Izotope dither plugins different from the UV22? Are one or the others correct or not correct? I haven’t tried this yet in another program to see how they treat metering after dither plugins.