diff --git a/crates/mix/src/lib.rs b/crates/mix/src/lib.rs
--- a/crates/mix/src/lib.rs
+++ b/crates/mix/src/lib.rs
@@ -1558,8 +1558,12 @@ mod processing_order_tests {
     }
 }
 
-/// Implicit solo: an aux is not muted when a soloed track feeds its input bus.
+/// Implicit solo: a folder or VCA is not muted when a soloed track feeds its input bus. An aux
+/// fed by a soloed track is muted by the solo unless it is Solo Safe.
 fn receives_solo(s: &Session, t: &Track) -> bool {
+    if !matches!(t.kind, TrackKind::Folder | TrackKind::Vca) {
+        return false;
+    }
     let Route::Bus(b) = &t.mixer.input else { return false };
     s.tracks
         .iter()
diff --git a/crates/mix/tests/it/strip_mute_automation.rs b/crates/mix/tests/it/strip_mute_automation.rs
--- a/crates/mix/tests/it/strip_mute_automation.rs
+++ b/crates/mix/tests/it/strip_mute_automation.rs
@@ -107,6 +107,20 @@ fn reading_modes_retain_existing_policy() {
     }
 }
 #[test]
+fn a_soloed_source_mutes_the_aux_it_feeds_unless_the_aux_is_solo_safe() {
+    let (mut s, source) = fixture();
+    let bus = s.add_bus("Feed", ChannelFormat::Stereo);
+    let aux = s.add_track(TrackKind::Aux, ChannelFormat::Stereo, Some("Return"));
+    s.track_mut(aux).unwrap().mixer.input = Route::Bus(bus);
+    s.track_mut(aux).unwrap().mixer.output = Route::Main;
+    s.track_mut(source).unwrap().mixer.output = Route::Bus(bus);
+    let reference = rendered(&s, 512);
+    s.track_mut(source).unwrap().mixer.solo = true;
+    assert!(rendered(&s, 512).iter().flatten().all(|x| x.abs() < 1e-6), "the aux the soloed source feeds is muted");
+    s.track_mut(aux).unwrap().mixer.solo_safe = true;
+    assert_eq!(rendered(&s, 512), reference, "Solo Safe keeps the aux audible");
+}
+#[test]
 fn static_mute_and_solo_suppression_cannot_be_reopened_by_automation() {
     for solo in [false, true] {
         let (mut s, t) = fixture();