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Does that latest OmniPak include all of the 'Extra Styles Paks 1-8', the 'Loops With Style Pak 1' and the '49-pak', etc?


Yes

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Or could I decide to just get the equivalent 'UltraPack 2021' upgrade on top of a 2020 OmniPak?


There isn't an OmniPAK upgrade specifically, however you could install a future upgrade over your existing OmniPAK, or install the "extras" from the OmniPAK (it includes the installers for them) onto the future HD you get.
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Andrew
PG Music Inc.