this feature is called a correction file and is a feature of some lossless/hybrid codecs (i.e. wavpack, optimfrog)
there is virtually 0% chance of this ever being considered for musepack, as it misses the focus of musepack (completely).
current development does not alter the psymodel or quality, it fixes bugs and works on furthering the adoption of the format (think decoding/encoding libraries, player plugins, small utilities, awareness, hardware support, etc.)
later
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