diff --git a/tests/project-effects.test.ts b/tests/project-effects.test.ts
index 71f087e..0ab2448 100644
--- a/tests/project-effects.test.ts
+++ b/tests/project-effects.test.ts
@@ -39,6 +39,16 @@ test('parses output compressor state from a 144-byte file without sidechain stat
   assert.equal(effects.sidechain, undefined);
 });
 
+test('parses sidechain controls from a 152-byte file without inventing routing', () => {
+  const fixture = effectsFile(152);
+  fixture.view.setFloat32(144, 0.25, true);
+  fixture.view.setFloat32(148, 0.75, true);
+
+  const effects = collectEffects([fixture.file]);
+
+  assert.deepEqual(effects.sidechain, { length: 0.25, shape: 0.75, routing: undefined });
+});
+
 test('parses P07-like output dynamics and sidechain state from a 160-byte file', () => {
   const fixture = effectsFile(160);
   fixture.view.setFloat32(32, 0.5, true);