how to set scale from AUX value

Hi,
i want to create a mix on ch5 with scale value is my aux4 value
sample:
aux 4 min 0 max 100 then
if my aux4 = 30 then i want

ch5 scale =30
and if aux4 = 80
ch5 scale=80

like ch5 scale=aux4.

can you help me ?

Thanks it works as i want.

vlad_vy wrote: You can try with complex mixer:
First page: you channel (ch5) mixer
Add second page with: source = AUX4, curve = 1-to-1, scale = 50, offset = 50, mux = mult