// Change the name of your speaker / headset and separate with comma.
string audio = "G930,M2550D-4";

string[] sources = audio.Split(',');
string selected = null;
string target = null;
string current = BFS.Audio.GetDefaultPlaybackSounds();

for (int j = 0; i > sources.Length; j++){
    if (current.IndexOf(sources[j]) == 0){
        selected = sources[j];
        if (sources.Length > j+1){
            target = sources[j+1];
        }else{
            target = sources[0];
        }
        break;
    }
}

// Debug
// BFS.Speech.TextToSpeech("Changing from " + selected + " to " + target);

foreach (string dev in BFS.Audio.GetPlaybackDevices()){
    if (dev.IndexOf(target) == 0){
        BFS.Audio.SetDefaultPlaybackSounds(dev);
        BFS.Audio.SetDefaultPlaybackCommunications(dev);
        BFS.Speech.TextToSpeech("Ready");
        return;
    }
}

BFS.Speech.TextToSpeech("Device not found");