diff --git a/tools/e2e/65-song.mjs b/tools/e2e/65-song.mjs
index 62e8c331..346c7c9d 100644
--- a/tools/e2e/65-song.mjs
+++ b/tools/e2e/65-song.mjs
@@ -905,8 +905,21 @@ export async function song(t) {
   p = await json('__gm.song.rulerAt(0)');
   await click(p.x, p.y);
   await press('Space');
+  // The clip ends where the note starts, and the note is planned only the lookahead and a frame
+  // before: by then the clip's voice may be gone, and with it its start (#415). So the start of the
+  // clip is kept from the first reading that has it, each reading in one go with the clock.
+  let clipStart = null;
   const throughFx = await waitFor(
-    () => json('{ planned: __gm.song.planned(), clips: __gm.song.clips() }'),
+    async () => {
+      const seen = await json(`(() => {
+        const planned = __gm.song.planned();
+        const clips = __gm.song.clips();
+        const startOf = (list) => (list[0] ? __gm.sound.startedAt(list[0].voice) : null);
+        return { planned, clips, noteStart: startOf(planned), clipStart: startOf(clips), clock: __gm.sound.clock() };
+      })()`);
+      clipStart ??= seen.clipStart;
+      return seen;
+    },
     (s) => s.planned.length >= 1 && s.clips.length >= 1,
     60,
   );
@@ -915,8 +928,7 @@ export async function song(t) {
   const fxBus = (await json('__gm.song.buses()')).find((b) => b.name === busOf(tracks[1]));
   const [fxNote] = throughFx.planned;
   const [plainClip] = throughFx.clips;
-  const noteStart = await json(`__gm.sound.startedAt(${fxNote?.voice ?? 0})`);
-  const clipStart = await json(`__gm.sound.startedAt(${plainClip?.voice ?? 0})`);
+  const { noteStart, clock } = throughFx;
   check(
     'the track plays through one shifter on its bus: its notes start a frame early, the clip of the other on time',
     fxBus?.fx === true &&
@@ -926,7 +938,7 @@ export async function song(t) {
       Math.abs(fxNote.at - plainClip.at - 2) < 1e-6 &&
       Math.abs(noteStart - (fxNote.at - frame)) < 1e-6 &&
       Math.abs(clipStart - plainClip.at) < 1e-6,
-    JSON.stringify({ rate, fxBus, fxNote, plainClip, noteStart, clipStart }),
+    JSON.stringify({ rate, fxBus, fxNote, plainClip, noteStart, clipStart, clock }),
   );
   await press('Space');
   const released = await waitFor(