If any source components exist on a sound without a source, assume the source should be created there and skip ancestry checks.

src/lib.rs

@@ -294,13 +294,49 @@ fn add_generator(
 
 fn add_sound_without_source(
     mut commands: Commands,
-    query: Query<Entity, (Added<Sound>, Without<Source>)>,
+    query: Query<
+        (
+            Entity,
+            Option<&PannerStrategy>,
+            Option<&AngularPan>,
+            Option<&ScalarPan>,
+            Option<&DistanceModel>,
+            Option<&DistanceRef>,
+            Option<&DistanceMax>,
+            Option<&Rolloff>,
+            Option<&ClosenessBoost>,
+            Option<&ClosenessBoostDistance>,
+        ),
+        (Added<Sound>, Without<Source>),
+    >,
     parents: Query<&Parent>,
     sources: Query<&Source>,
 ) {
-    for entity in &query {
+    for (
+        entity,
+        panner_strategy,
+        scalar_pan,
+        angular_pan,
+        distance_model,
+        distance_ref,
+        distance_max,
+        rolloff,
+        closeness_boost,
+        closeness_boost_distance,
+    ) in &query
+    {
         let mut has_source = false;
         let mut target = entity;
+        if panner_strategy.is_none()
+            && angular_pan.is_none()
+            && scalar_pan.is_none()
+            && distance_model.is_none()
+            && distance_ref.is_none()
+            && distance_max.is_none()
+            && rolloff.is_none()
+            && closeness_boost.is_none()
+            && closeness_boost_distance.is_none()
+        {
             while let Ok(parent) = parents.get(target) {
                 if sources.get(**parent).is_ok() {
                     has_source = true;
@@ -308,6 +344,7 @@ fn add_sound_without_source(
                 }
                 target = **parent;
             }
+        }
         if !has_source {
             commands.entity(entity).insert(Source::default());
         }
@@ -754,6 +791,9 @@ impl Plugin for SynthizerPlugin {
                 update_sound_playback_state.label(SynthizerSystems::UpdateState),
             )
             .add_system_to_stage(CoreStage::PostUpdate, remove_sound)
-            .add_system_to_stage(CoreStage::PreUpdate, events);
+            .add_system_to_stage(
+                CoreStage::PostUpdate,
+                events.after(SynthizerSystems::UpdateState),
+            );
     }
 }