diff --git a/libs/backends/alsa/alsa_audiobackend.cc b/libs/backends/alsa/alsa_audiobackend.cc
index f957437711..fcbf8871cc 100644
--- a/libs/backends/alsa/alsa_audiobackend.cc
+++ b/libs/backends/alsa/alsa_audiobackend.cc
@@ -475,6 +475,9 @@ AlsaAudioBackend::_start (bool for_latency_measurement)
 		return -1;
 	}
 
+	engine.sample_rate_change (_samplerate);
+	engine.buffer_size_change (_samples_per_period);
+
 	if (engine.reestablish_ports ()) {
 		PBD::error << _("AlsaAudioBackend: Could not re-establish ports.") << endmsg;
 		delete _pcmi; _pcmi = 0;
@@ -482,7 +485,6 @@ AlsaAudioBackend::_start (bool for_latency_measurement)
 		return -1;
 	}
 
-	engine.buffer_size_change (_samples_per_period);
 	engine.reconnect_ports ();
 	_run = true;
 
@@ -1284,6 +1286,8 @@ AlsaAudioBackend::main_process_thread ()
 	_pcmi->pcm_start ();
 	int no_proc_errors = 0;
 
+	manager.graph_order_callback();
+
 	while (_run) {
 		long nr;
 		bool xrun = false;
diff --git a/libs/backends/dummy/dummy_audiobackend.cc b/libs/backends/dummy/dummy_audiobackend.cc
index 1f918e7ed7..04ef7168e8 100644
--- a/libs/backends/dummy/dummy_audiobackend.cc
+++ b/libs/backends/dummy/dummy_audiobackend.cc
@@ -311,13 +311,15 @@ DummyAudioBackend::_start (bool /*for_latency_measurement*/)
 		return -1;
 	}
 
+	engine.sample_rate_change (_samplerate);
+	engine.buffer_size_change (_samples_per_period);
+
 	if (engine.reestablish_ports ()) {
 		PBD::error << _("DummyAudioBackend: Could not re-establish ports.") << endmsg;
 		stop ();
 		return -1;
 	}
 
-	engine.buffer_size_change (_samples_per_period);
 	engine.reconnect_ports ();
 
 	if (pthread_create (&_main_thread, NULL, pthread_process, this)) {
@@ -1004,6 +1006,8 @@ DummyAudioBackend::main_process_thread ()
 	_running = true;
 	_processed_samples = 0;
 
+	manager.graph_order_callback();
+
 	uint64_t clock1, clock2;
 	clock1 = g_get_monotonic_time();
 	while (_running) {