diff --git a/audio/audiotools/core/_julius.py b/audio/audiotools/core/_julius.py
index 929efb6bc..459c7255a 100644
--- a/audio/audiotools/core/_julius.py
+++ b/audio/audiotools/core/_julius.py
@@ -1,5 +1,3 @@
-# File under the MIT license, see https://github.com/adefossez/julius/LICENSE for details.
-# Author: adefossez, 2020
 """
 Implementation of a FFT based 1D convolution in PaddlePaddle.
 While FFT is used in some cases for small kernel sizes, it is not the default for long ones, e.g. 512.
diff --git a/audio/tests/audiotools/core/test_bands✅.py b/audio/tests/audiotools/core/test_bands✅.py
index 55162708c..5ee29eaf6 100644
--- a/audio/tests/audiotools/core/test_bands✅.py
+++ b/audio/tests/audiotools/core/test_bands✅.py
@@ -1,5 +1,3 @@
-# File under the MIT license, see https://github.com/adefossez/julius/LICENSE for details.
-# Author: adefossez, 2020
 import random
 import sys
 import unittest
diff --git a/audio/tests/audiotools/core/test_effects✅.py b/audio/tests/audiotools/core/test_effects✅.py
index 586e25cb2..0063d3cea 100644
--- a/audio/tests/audiotools/core/test_effects✅.py
+++ b/audio/tests/audiotools/core/test_effects✅.py
@@ -353,6 +353,3 @@ def test_ensure_max_of_audio():
     after = spk.deepcopy().ensure_max_of_audio()
 
     assert paddle.allclose(after.audio_data, spk.audio_data)
-
-
-test_normalize()
diff --git a/audio/tests/audiotools/core/test_fftconv✅.py b/audio/tests/audiotools/core/test_fftconv✅.py
index 63c9a1fb0..2296673ee 100644
--- a/audio/tests/audiotools/core/test_fftconv✅.py
+++ b/audio/tests/audiotools/core/test_fftconv✅.py
@@ -1,4 +1,3 @@
-# File under the MIT license, see https://github.com/your_repo/your_license for details.
 import random
 import sys
 import unittest
diff --git a/audio/tests/audiotools/core/test_highpass✅.py b/audio/tests/audiotools/core/test_highpass✅.py
index 50485b393..936a2daae 100644
--- a/audio/tests/audiotools/core/test_highpass✅.py
+++ b/audio/tests/audiotools/core/test_highpass✅.py
@@ -1,5 +1,3 @@
-# File under the MIT license, see https://github.com/adefossez/julius/LICENSE for details.
-# Author: adefossez, 2020
 import math
 import random
 import sys
diff --git a/audio/tests/audiotools/core/test_lowpass✅.py b/audio/tests/audiotools/core/test_lowpass✅.py
index 61f56a6dc..dc45a8dbc 100644
--- a/audio/tests/audiotools/core/test_lowpass✅.py
+++ b/audio/tests/audiotools/core/test_lowpass✅.py
@@ -1,5 +1,3 @@
-# File under the MIT license, see https://github.com/adefossez/julius/LICENSE for details.
-# Author: adefossez, 2020
 import math
 import random
 import sys