diff --git a/crates/engine/src/cmd/midi.rs b/crates/engine/src/cmd/midi.rs
index 10bcd767..129fd070 100644
--- a/crates/engine/src/cmd/midi.rs
+++ b/crates/engine/src/cmd/midi.rs
@@ -126,8 +126,8 @@ fn notes_move(e: &mut Engine, p: &Value) -> Result<Value> {
     let seq = seq_mut(e, id, "midi.notes_move")?;
     for (i, n) in seq.notes.iter_mut().enumerate() {
         if idx.contains(&i) {
-            n.start = (n.start + dt).max(0);
-            n.pitch = (i64::from(n.pitch) + ds).clamp(0, 127) as u8;
+            n.start = n.start.saturating_add(dt).max(0);
+            n.pitch = i64::from(n.pitch).saturating_add(ds).clamp(0, 127) as u8;
         }
     }
     seq.sort();
@@ -157,6 +157,21 @@ mod tests {
         assert!(e.execute("midi.note_edit", &json!({"clip": clip, "index": 99})).is_err());
     }
 
+    #[test]
+    fn notes_move_huge_params_do_not_overflow() {
+        let mut e = Engine::default();
+        let t = e.session_mut().add_track(TrackKind::Instrument, ChannelFormat::Stereo, Some("Keys"));
+        let r = e.execute("midi.new_clip", &json!({"track": t.0})).unwrap();
+        let clip = r["clip"].as_u64().unwrap();
+        e.execute("midi.note_add", &json!({"clip": clip, "pitch": 60, "start_ticks": 480})).unwrap();
+        e.execute("midi.notes_move", &json!({"clip": clip, "indices": [0], "ticks": i64::MAX})).unwrap();
+        let n = e.execute("midi.notes", &json!({"clip": clip})).unwrap();
+        assert_eq!(n["notes"][0]["start"], i64::MAX);
+        e.execute("midi.notes_move", &json!({"clip": clip, "indices": [0], "semitones": i64::MAX})).unwrap();
+        let n = e.execute("midi.notes", &json!({"clip": clip})).unwrap();
+        assert_eq!(n["notes"][0]["pitch"], 127);
+    }
+
     #[test]
     fn rejects_audio_tracks() {
         let mut e = Engine::default();