[Feature] velocity based gradient or brightness

[sreich]

I would like a setting similar to "rainbow velocity". But the velocity the keys are pressed at would instead affect the brightness

Separately, an additional feature on top would be to set a gradient. Say, if I want it to go from red to purple to white, instead of being stuck with the rainbow velocity

This feature is incredibly useful for being able to practice the force you apply to keys, in ways that I don't think the ear can. So, really awesome feature that's already there. These additional features would really help my practice for dynamics at piano