diff --git a/services/mam-api/src/routes/sequences.js b/services/mam-api/src/routes/sequences.js
index 97fc0bf..778836a 100644
--- a/services/mam-api/src/routes/sequences.js
+++ b/services/mam-api/src/routes/sequences.js
@@ -10,27 +10,33 @@ router.use(requireAuth);
 // ── 59.94 DF timecode helpers (for EDL export) ────────────────────────────────
 const NOM  = 60;   // nominal integer fps
 const DROP = 4;    // frames dropped per minute (except every 10th)
-const FRAMES_PER_MIN   = NOM * 60 - DROP;         // 3596
+const FRAMES_FIRST_MIN = NOM * 60;                   // 3600 — first (non-drop) minute per 10-min group
+const FRAMES_PER_MIN   = NOM * 60 - DROP;            // 3596
 const FRAMES_PER_10MIN = FRAMES_PER_MIN * 10 + DROP; // 35964
-const FRAMES_PER_HOUR  = FRAMES_PER_10MIN * 6;    // 215784
+const FRAMES_PER_HOUR  = FRAMES_PER_10MIN * 6;       // 215784
 
 function pad2(n) { return String(Math.floor(n)).padStart(2, '0'); }
 
 function framesToTC(totalFrames) {
-  const fc  = Math.max(0, Math.round(totalFrames));
-  const h   = Math.floor(fc / FRAMES_PER_HOUR);
-  let rem   = fc % FRAMES_PER_HOUR;
-  const tm  = Math.floor(rem / FRAMES_PER_10MIN);
-  rem       = rem % FRAMES_PER_10MIN;
-  let m     = 0;
-  if (rem >= DROP) {
-    m   = Math.floor((rem - DROP) / FRAMES_PER_MIN) + 1;
-    rem = (rem - DROP) % FRAMES_PER_MIN;
+  const fc = Math.max(0, Math.round(totalFrames));
+  const h  = Math.floor(fc / FRAMES_PER_HOUR);
+  let rem  = fc % FRAMES_PER_HOUR;
+  const tm = Math.floor(rem / FRAMES_PER_10MIN);
+  rem      = rem % FRAMES_PER_10MIN;
+  let m, ss, ff;
+  // The first minute of each 10-minute group is non-drop (rem < 3600).
+  // Minutes 1-9 are drop-frame and start at frame label :00;04.
+  if (rem < FRAMES_FIRST_MIN) {
+    m  = 0; ss = Math.floor(rem / NOM); ff = rem % NOM;
+  } else {
+    rem -= FRAMES_FIRST_MIN;
+    m   = Math.floor(rem / FRAMES_PER_MIN) + 1;
+    const remInMin = rem % FRAMES_PER_MIN;
+    const adj = remInMin + DROP; // shift so label starts at :00;04
+    ss = Math.floor(adj / NOM); ff = adj % NOM;
   }
-  const M  = tm * 10 + m;
-  const s  = Math.floor(rem / NOM);
-  const ff = rem % NOM;
-  return `${pad2(h)}:${pad2(M)}:${pad2(s)};${pad2(ff)}`;
+  const M = tm * 10 + m;
+  return `${pad2(h)}:${pad2(M)}:${pad2(ss)};${pad2(ff)}`;
 }
 
 function generateEDL(seqName, clips) {