Does anyone know of a way to test my Raceceiver when not at the track? I lost audio Saturday night after hotlaps and can't tell if it's the unit or my earpieces; plugging into another device, only the left earpiece has sound, nothing when I plug into the Raceceiver. I know that I should replace the headset but I'd like to verify with a working set of headphones whether the radio also needs to be replaced.