Need to just filter out volume messages

Hi there. I'm new to MIDI Fire and the forum, but I'm convinced I can do this: I have a performance situation in which I will have two different MIDI controllers mapped to the same sound app. This works in general, in terms of playing notes, but it confuses the hell out of the app when I have two different volume/expression pedals running. I need Stream Byter code that just filters out any Volume commands from one of the MIDI controllers. Is this easy to pull off?

Thanks