+
+Mackie::LedState
+MackieControlProtocol::read_press (Mackie::Button&)
+{
+ _metering_active = !_metering_active;
+ notify_metering_state_changed ();
+ return _metering_active;
+}
+Mackie::LedState
+MackieControlProtocol::read_release (Mackie::Button&)
+{
+ return _metering_active;
+}
+Mackie::LedState
+MackieControlProtocol::write_press (Mackie::Button&)
+{