PBD::DebugBits PBD::DEBUG::BackendAudio = PBD::new_debug_bit ("backendaudio");
PBD::DebugBits PBD::DEBUG::BackendTiming = PBD::new_debug_bit ("backendtiming");
PBD::DebugBits PBD::DEBUG::BackendThreads = PBD::new_debug_bit ("backendthreads");
+PBD::DebugBits PBD::DEBUG::BackendPorts = PBD::new_debug_bit ("backendports");