Yamaha CS80

Hi all
I ask your kind help in explaining the difference between "Sustain" I and II.
A first question: what is the method of stealing the notes with CS80 in Sustain I, I mean, how the notes are stealed when all voices are assigned when Sustain I is applied? Is it "steal the oldest note"?
And what about the Sustain II? Does the method change to "steal the last played note"?
Question is: if the KAS assigns to newest note all the time, why the envelopes do retrigger in "Sustain I" ?
Please, Kent or Chris or anybody skilled, the patents or documents on JH's site don't help me, can you give me a simple explaination?
Thanks for your care.
Max


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