Touch Feedback during trial

Hello,

I am wondering how I might be able to implement some subtle feedback when a tracker such as touch is within a threshold. For instance, on many phones, when a button is touched, the button will darken momentarily and can also grow a small amount if held.

My current goal is to take a purely white circle graphic [1 1 1] and darken it slightly while it is being touched. I would also like to have it grow slightly (*1.1 diameter) while it is being touched. It would be ideal if I could set up an interpolation period between the two states (pressed, not pressed) so that it does not switch states immediately but rather over a short duration.

Would this be possible with the GraphicProperty adapter and FixTimeAnalyzer? Please advise, thank you!

See the attached task. You can also make your own adapter for this kind of stuff, if it cannot be done with existing adapters.