Etc Ion 2.9 followspot iris fader

Hi, I’ve an ETC Ion Classic with the 2x10 Fader wing.  Currently programming follow spots for the first time.  I need to be able to control intensity on one fader and iris on the next fader but can’t seem to make it happen. 
I have recorded sub 11 and 12 with the followspot intensity at max, then in the sub properties isolated the attributes to intensity on sub 11 and iris on sub 12.  Intensity works, iris doesn’t.  
I’m pretty sure there must be a way to do this but just can’t figure it out.  Can anyone give any guidence at all?  

many thanks 

andy

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