Audio Route Change Dictionary Keys Keys for obtaining information about an audio hardware route change. TopicsConstantskAudioSession_RouteChangeKey_ReasonkAudioSession_AudioRouteChangeKey_PreviousRouteDescriptionkAudioSession_AudioRouteChangeKey_CurrentRouteDescription See AlsoAudio RoutesAudio Route Change ReasonsAudio Route Description Dictionary KeysAudio Route Type KeyAudio Input RoutesAudio Output RoutesAlternative Audio Route Change Reason Dictionary Key