diff --git a/sync_audio_test.py b/sync_audio_test.py
index 7f61ed6..7937389 100644
--- a/sync_audio_test.py
+++ b/sync_audio_test.py
@@ -13,7 +13,7 @@ Run: make ast  or  .venv/bin/python sync_audio_test.py --config config.toml
 """
 
 from __future__ import annotations
-import os, sys, math, argparse
+import os, sys, math, argparse, signal
 import numpy as np
 
 # allow tomllib (py3.11+) with tomli fallback
@@ -38,7 +38,7 @@ except ImportError:
     HAS_SD = False
 
 from sync_audio import load_wav, correlate, device_info, lag_to_seconds
-from waveform_cache import cached_load_wav
+
 
 
 def load_config(path: str) -> dict:
@@ -126,9 +126,9 @@ class SyncWindow(QtWidgets.QMainWindow):
 
         # load
         print(f"Loading {a_path}")
-        self.a, self.sr_a = cached_load_wav(a_path, target_sr=sr)
+        self.a, self.sr_a = load_wav(a_path, target_sr=sr)
         print(f"Loading {b_path}")
-        self.b, self.sr_b = cached_load_wav(b_path, target_sr=sr)
+        self.b, self.sr_b = load_wav(b_path, target_sr=sr)
         # keep originals for lag apply
         self.a_orig = self.a.copy()
         self.b_orig = self.b.copy()
@@ -523,6 +523,7 @@ def main():
         print(f"ERROR: B not found {b_path}", file=sys.stderr); sys.exit(1)
 
     app = QtWidgets.QApplication(sys.argv)
+    signal.signal(signal.SIGINT, signal.SIG_DFL)
     # Dark theme: Fusion style + dark palette (works without kvantum)
     app.setStyle("Fusion")
     dark = QtGui.QPalette()
diff --git a/verify_sync.py b/verify_sync.py
index 636dbfd..ed2062e 100644
--- a/verify_sync.py
+++ b/verify_sync.py
@@ -22,7 +22,7 @@ Usage:
 """
 
 from __future__ import annotations
-import os, sys, math, argparse, subprocess, json, shutil, threading, tempfile, warnings, locale
+import os, sys, math, argparse, subprocess, json, shutil, threading, tempfile, warnings, locale, signal
 import numpy as np
 
 locale.setlocale(locale.LC_NUMERIC, "C")
@@ -57,7 +57,6 @@ except ImportError:
     HAS_SD = False
 
 from sync_audio import load_wav
-from waveform_cache import cached_load_wav
 
 
 # ─── Helpers ───
@@ -206,9 +205,9 @@ class VerifyWindow(QtWidgets.QMainWindow):
 
         # Load audio
         print(f"Loading audio A: {wav_a_path}")
-        self.a_orig, _ = cached_load_wav(wav_a_path, target_sr=sr)
+        self.a_orig, _ = load_wav(wav_a_path, target_sr=sr)
         print(f"Loading audio B: {wav_b_path}")
-        self.b_orig, _ = cached_load_wav(wav_b_path, target_sr=sr)
+        self.b_orig, _ = load_wav(wav_b_path, target_sr=sr)
 
         # Apply lag alignment
         self.a_aligned, self.b_aligned = apply_lag(self.a_orig, self.b_orig, self.lag_samples)
@@ -649,6 +648,7 @@ def main():
     print(f"Lag:     {lag_sec:+.6f}s")
 
     app = QtWidgets.QApplication(sys.argv)
+    signal.signal(signal.SIGINT, signal.SIG_DFL)
     apply_dark_theme(app)
 
     w = VerifyWindow(video_path, wav_a, wav_b, sr=sr, lag_sec=lag_sec,
diff --git a/waveform_cache.py b/waveform_cache.py
deleted file mode 100644
index f99b25a..0000000
--- a/waveform_cache.py
+++ /dev/null
@@ -1,29 +0,0 @@
-"""
-Shared waveform cache — avoids re-reading and re-decoding large WAV files
-when the same file is loaded multiple times (e.g. sync_audio_test → verify).
-"""
-
-from __future__ import annotations
-import os
-import numpy as np
-
-_cache: dict[tuple[str, int], np.ndarray] = {}
-
-
-def cached_load_wav(path: str, target_sr: int = 48000) -> tuple[np.ndarray, int]:
-    """Load a WAV file with caching. Returns (audio_array, sample_rate)."""
-    real_path = os.path.realpath(path)
-    key = (real_path, target_sr)
-    if key in _cache:
-        print(f"  (cached: {os.path.basename(path)})")
-        return _cache[key].copy(), target_sr
-
-    # Import here to avoid circular imports
-    from sync_audio import load_wav
-    data, sr = load_wav(path, target_sr=target_sr)
-    _cache[key] = data
-    return data, sr
-
-
-def clear_cache():
-    _cache.clear()