sigc::signal<void, const std::string &> signal_name_changed;
sigc::signal<void, const std::string &, float> signal_control_changed;
sigc::signal<void, unsigned, bool> signal_function_changed;
sigc::signal<void, const std::string &> signal_name_changed;
sigc::signal<void, const std::string &, float> signal_control_changed;
sigc::signal<void, unsigned, bool> signal_function_changed;