diff --git a/tools/e2e/68-composition.mjs b/tools/e2e/68-composition.mjs
index cb3a9c35..0b3b8093 100644
--- a/tools/e2e/68-composition.mjs
+++ b/tools/e2e/68-composition.mjs
@@ -432,7 +432,13 @@ export async function composition(t) {
   const ran = toneRows.findIndex((row) => row.time > 0);
   const reached = toneRows.find((row) => row.time >= 0.5);
   const toneClip = toneRows.at(-1)?.clip;
-  const early = reached && toneClip ? reached.clock - toneClip.at : null;
+  // How far the sound runs ahead of the picture in that frame: the frame may come past 0.5, and the
+  // sound is held to the picture only within SLIP (40 ms, compositionSound.ts). `videoTime` counts
+  // in whole frames of the cut while the sound follows the unrounded time, so the picture read here
+  // can lie up to one frame (1/60 s) behind what the sound is held to; 5 ms more for the audio clock
+  // moving on between the game's frame and this one. A fixed 50 ms failed at 52 and 61 ms in CI
+  // (tasks 740, 741) with the sound inside all of that.
+  const early = reached && toneClip ? reached.clock - toneClip.at - (reached.time - 0.5) : null;
   check(
     'a sound item is planned only once the cut’s clock runs, for when the cut reaches it, to its end',
     ran > 0 &&
@@ -442,7 +448,7 @@ export async function composition(t) {
       Math.abs(toneClip.duration - 0.5) < 0.002 &&
       early !== null &&
       early > -0.02 &&
-      early < 0.05,
+      early < 0.04 + 1 / 60 + 0.005,
     JSON.stringify({ waited: ran, early, reached, toneClip }),
   );
   // 68i. The sound item picked the composition's bus, the video item picked none: both go into the