I'm attempting to create a horn/strobe family using an annotation symbol for the plan view.

What I'm not understanding is how the scaling of this symbol will work. In ACAD, I would draw the symbol at 1:1 and scale it according to the drawing scale I was working in, x48 for 1/4" scale, x96 for 1/8" scale, etc. Digging in to one of the receptacle families that came with Revit, I see that the annotation symbol is 11/64" tall when created but is almost 9" when inserted into a 1/4"=1'-0" scale drawing.

What determines how the annotation symbol will be scaled?

Thanks for any help offered.