[Cesar Siena]

Roland, it work perfectly! Awesome! And I still continue to control all of them (around 80 expression controllers)!) from one place! Thank you very much! Best regards!

[Cesar Siena]

Thanks for the fast answer. I will try it as soon as possible (it’s 02:00h at dawn around here…). But I didn’t understand somethings:
The opacity of each layer is pickwhipped to checkbox controllers in a Master Null controller (so it’s easier to have full control of everything in one place – the number of layers is very high). When activated, they result in hold keyframes in the timeline.
So, how could I use your expression, knowing that there are checkbox controllers involved, messing the expressions? Where or how could I put/use it? Thank you!

[Cesar Siena]

. Simon, this is the most didactic step by step post and clarifies minor, but fundamental doubts, that weren’t well explained in any other post for beginners in the internet, congratulations and thank you!
. If you allow me to go a little further, I’d like to ask the following: You’ve parented the violin to the hand’s puppet pin, ok? So:
. A) If I choose to control the puppet pin with a null object, would you parent the violin to the hand’s puppet pin and this to the Null? how would you do?
. B) Could I simply parent everything to the Null? That is, could I parent the violin to the Position property of the Null and also parent the hand’s puppet pin to it’s position and rotation and add a Slider Control to the Null?
. Thank you very much.