@d-healey This is not something that implemented, yet. Script panel mouse wheel callback still not implemented. (Checked the sourcecodes as well on github, latest branch) Although, it is detected by JUCE, but the event could not be catched as there is no event.wheelup or wheeldown or anything like that. An EQ contains scrollwheel callback indeed, just like the knobs, but other components like images or panels are not. Panels should have this feature.
I'm also looking for some workaround for detecting if the mouse wheel scrolled up or down under a specific Panel widget.
@d-healey @Christoph-Hart - any idea how to achieve this?