VST vs. VST3 (side-chain compression) [Reaper & Ableton]

Could someone be kind enough to explain to me what the deal is with only VST3’s that can work side-chain compression and not VST’s?

Thanks!

To my understanding, and I maybe wrong here, but I don’t believe the actual VST spec supported sidechain until VST3.

But perhaps someone else will know for sure.

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