[vorbis] Cascading?

[Aleksandar Dovnikovic]

During the interesting interview that binaryfreedom has made with Monty
and Jack, Monty mentions cascading, a feature that will be added, quote:
"Cascading is the ability to make multiple passes through the frequency
spectrum, iteratively filling in more detail, like a progressive jpeg".
What are the advantages of something like this - does this generally
improves quality or is it used primarily to put more important audio data
at the beggining of the block so that bitrate peeling might be effectively
applied?

Greetings,
Aleksandar

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