void transition_clicked(int transition_number);
void channel_clicked(int channel_number);
void wb_button_clicked(int channel_number);
void set_transition_names(std::vector<std::string> transition_names);
void update_channel_name(Mixer::Output output);
void transition_clicked(int transition_number);
void channel_clicked(int channel_number);
void wb_button_clicked(int channel_number);
void set_transition_names(std::vector<std::string> transition_names);
void update_channel_name(Mixer::Output output);