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An FPGA is for digital stuff. I don’t think you’re spreading stupidity, I just wanted to add my impression of what I think might be going on here.
I’m not aware of a firmware update for the A4 that changed something about the oscs (is there a list of release notes somewhere?), but I do know they added an option to boost the resonance on the ladder filter recently.
Something like that can be done by increasing the range or transfer curve of the control voltage that’s generated from the digital parameter values. They’re not changing the analog circuitry, they’re simply feeding it different voltages when you turn the knobs. 