diff --git a/tests/renderer/utils.py b/tests/renderer/utils.py
index a538df7ee83c6a771fbf992e0aad18c2ef0bdfc4..d569fff6c7e74675bd04636ace9f818d5a202c0a 100644
--- a/tests/renderer/utils.py
+++ b/tests/renderer/utils.py
@@ -41,10 +41,19 @@ import numpy as np
 import pytest
 
 from .compare_audio import compare_audio_arrays
-from .constants import *
+from .constants import (
+    SCRIPTS_DIR,
+    OUTPUT_PATH_REF,
+    OUTPUT_PATH_CUT,
+    FORMAT_TO_FILE_COMPARETEST,
+    FORMAT_TO_FILE_SMOKETEST,
+    RENDERER_CMD,
+    BIN_SUFFIX_MERGETARGET,
+)
 
 sys.path.append(SCRIPTS_DIR)
 from pyaudio3dtools.audiofile import readfile
+from .. import cmp_pcm
 
 
 # fixture returns test information, enabling per-testcase SNR
@@ -70,7 +79,7 @@ def check_BE(
     cut: np.ndarray,
     cut_fs: int,
     xfail: bool = False,
-    atol: int = 2
+    atol: int = 2,
 ):
     if ref is None or np.array_equal(ref, np.zeros_like(ref)):
         pytest.fail("REF signal does not exist or is zero!")
@@ -117,6 +126,7 @@ def run_renderer(
     hrtf_file: Optional[str] = None,
     get_mld=False,
     mld_lim=0,
+    get_mld_lim=0,
 ) -> str:
     # prepare arguments and filepaths
     if trj_file is not None:
@@ -238,6 +248,8 @@ def run_renderer(
         out_file_ref = str(OUTPUT_PATH_REF.joinpath(out_file_stem))
 
         if get_mld:
+            # see constants.py
+            ref_fs = cmd[10]
             output_differs, reason = cmp_pcm(
                 out_file,
                 out_file_ref,