+ // listen for latency changes
+ AudioUnitEvent event;
+ event.mEventType = kAudioUnitEvent_PropertyChange;
+ event.mArgument.mProperty.mAudioUnit = unit->AU();
+ event.mArgument.mProperty.mPropertyID = kAudioUnitProperty_Latency;
+ event.mArgument.mProperty.mScope = kAudioUnitScope_Global;
+ event.mArgument.mProperty.mElement = 0;
+
+ if (AUEventListenerAddEventType (_parameter_listener, _parameter_listener_arg, &event) != noErr) {
+ PBD::error << "Failed to create latency event listener\n";
+ // TODO don't cache _current_latency
+ }
+