VST is native and actually better for the CPU in the SurgeXT case.
I also use it in LV2, and now I've all my projects that needs a conversion from that, maybe I could compile the 1.2 version from source; I don't know but it's annoying ¢_¢
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Oh yeah, I've found it here so I can save my presets! https://archive.archlinux.org/packages/s/
There's a reason to prefer opus over flac?