| Dithering should only be applied at the very last stage of the mix, when your going form a higher bit depth, to a lower bit depth. Like going form 24bit to 16bit.
You do not dither when you go from a lower bit depth to a higher bit depth. You only need to dither when going down in bit depths. So, if you go from 24bit to 32bit floating point, you do not need to dither.
Cj
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