How is Comm2 selected on the C130?

Hello.I was wondering how to select comm 2 as the active VHF radio on the CaptianSim C130?I have tried using the default keyboard commands that FS9 uses to select between comm radios, but they don't seem to do anything on the CaptianSim C130.I like to fly this plane using Radar Contact sometimes, and I need to mute Comm 1 and make comm 2 the active one so I can hear the Radar Contact controller instead of the FS9 one.Thanks!Scott :-)