Proportional Level wheel

So I'm using an ion and I am trying to find a way to select my channels on stage and be able to proportionally dim or brighten them all. so like if i have channel 2 @50 and 3 @ 100

if I use the level wheel it removes the same amount of intensity from each channel but I want it to remove it proportionally so I could end up with an intensity of something like 2@ 25 and 100 @50.

Thank you

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