The only way I know of changing the value of parameters in Korg MDE-X and Korg MS-20FX is by dragging the knobs, and they’re completely stuck where they are, even if the hand-cursor shows up.
A get-around for this problem right now is disabling graphic-mode, but for multi-FX plugins with complex Menu-based GUI like these two plugins, this creates more issues as audacity freezes for a long while trying to load possible parameters and then gives you a huge list of them. You can change the parameters if you work out which sliders are active in each mode.
System:
Korg MDE-X 2.4.2
Korg MS-20FX 2.4.3
Audacity 3.6.1
Windows 11 Pro x64
Intel Core i5-8400 @ 2.8 GHz
I dunno if this is the right forum category to post issues in?
Best regards, asikwus