Possible to create a pitch map?

Is it possible to create a pitch map in MainStage? I need to do a harp glissando so I'd like to imitate the functionality of harp pedals. For example, transpose all G up a half step, F down a half step, A down a half step, etc.

I know how to do this in Logic with a Transformer in the Environment but so far all I've found in MainStage is ways to map controllers, not pitches.