dynamical size for this patch (num + multislider)

FP's icon

hi,

i can't figure out how to do this patch dynamically.
for some reason (linked to my preset patch for individual interpolation), i need to have several clients (pattr) for the multislider.
i found this and it works well.
now, to improve it, i would like have a dynamical version. i tried but i can't.
any help ?

here's the poly~ named "MasterFader":

Max Patch
Copy patch and select New From Clipboard in Max.

here's the patch:

Max Patch
Copy patch and select New From Clipboard in Max.