diff --git a/tools/test_fixed_key_voicing.py b/tools/test_fixed_key_voicing.py
index af65739..fa4e20c 100644
--- a/tools/test_fixed_key_voicing.py
+++ b/tools/test_fixed_key_voicing.py
@@ -37,7 +37,8 @@ CASES = [
     ("G", 7, 10, "C", (43, 48, 52, 55, 60, 64)),
     ("G", 7, 13, "D", (42, 45, 50, 57, 62, 66)),
     ("G", 7, 16, "Em", (40, 47, 52, 55, 59, 64)),
-    ("G", 7, 19, "#Fm", (42, 49, 54, 58, 61, 66)),
+    # 键 19 出厂是小三：C 调 IV 的 Fm 行再 +1
+    ("G", 7, 19, "#Fm", (42, 49, 54, 57, 61, 66)),
     # D I = C 调 II 行；F# I = F 调 I 行全体 +1
     ("D", 2, 1, "D", (42, 45, 50, 57, 62, 66)),
     ("F#", 6, 1, "F#", (42, 49, 54, 58, 61, 66)),
@@ -55,8 +56,9 @@ def last_string_note(text: str, string_n: int) -> int | None:
 def main() -> int:
     fails = 0
     print("=== 固定调六弦音高 RTT ===", flush=True)
-    with open_session(reset=False) as sess:
+    with open_session(reset=True) as sess:
         sess.cmd("tone pick f", settle=1.0)
+        sess.cmd("log level E", settle=0.3)
         sess.cmd("chord key 23", settle=0.3)
         sess.cmd("chord key 0", settle=0.2)
         cur_xp = None
@@ -69,10 +71,19 @@ def main() -> int:
             print(f"\n-- {key_name} {chord} key={key} xp={xp}", flush=True)
             for s in range(6, 0, -1):
                 expect = int(notes[6 - s])
-                n0 = len(sess.lines)
-                sess.cmd(f"string {s}", settle=0.12)
-                sess.cmd(f"string {s} off", settle=0.05)
-                got = last_string_note("\n".join(sess.lines[n0:]), s)
+                got = None
+                for _try in range(4):
+                    n0 = len(sess.lines)
+                    sess.cmd(f"string {s}", settle=0.02)
+                    deadline = time.monotonic() + 0.6
+                    while time.monotonic() < deadline:
+                        got = last_string_note("\n".join(sess.lines[n0:]), s)
+                        if got is not None:
+                            break
+                        sess.pump(0.04)
+                    if got is not None:
+                        break
+                sess.cmd(f"string {s} off", settle=0.02)
                 ok = got == expect
                 if not ok:
                     fails += 1