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A red light on a button means there was a power fault. You just need to push it twice to reset and engage the system again. To power On or Off the DGIV, simply follow the check-list that is on the lower panel. RADIO TIPS: The Radio power button forces OrbiterSound to play ATC even if you disabled ATC option in
SoundConfig.exe. Simply turn radio power OFF if you don't want ATC anymore.