diff --git a/intern/object_mix.py b/intern/object_mix.py
index 5b6e4c4..63b2596 100644
--- a/intern/object_mix.py
+++ b/intern/object_mix.py
@@ -4,12 +4,14 @@ from contextlib import contextmanager
 from fractions import Fraction
 from typing import List
 
-from ear.fileio.adm.elements import (ObjectCartesianPosition, JumpPosition,
-                                     AudioBlockFormatObjects)
-from ear.fileio.bw64 import Bw64Reader
+import wave
 
-from .geom_utils import (speaker_active_time_range, compute_relative_vector,
-                         room_norm_vector)
+# from ear.fileio.adm.elements import (ObjectCartesianPosition, JumpPosition,
+#                                      AudioBlockFormatObjects)
+# from ear.fileio.bw64 import Bw64Reader
+
+# from .geom_utils import (speaker_active_time_range, compute_relative_vector,
+#                          room_norm_vector)
 from .speaker_utils import solo_speakers, unmute_all_speakers
 
 
@@ -50,33 +52,25 @@ class ObjectMix:
     def frame_end(self):
         return self.scene.frame_end
 
-    @property
-    def sample_rate(self):
-        return self.mixdown_reader.sampleRate
+    @property 
+    def sample_rate(self) -> int | None:
+        if self.intermediate_filename:
+            with wave.open(self.intermediate_filename, "rb") as f:
+                return f.getframerate()
+        else:
+            return None
 
     @property
-    def bits_per_sample(self):
-        return self.mixdown_reader.bitdepth
+    def bits_per_sample(self) -> int | None:
+        with wave.open(self.mixdown_filename, "rb") as f:
+            return f.getsampwidth() * 8
 
     @property
-    def mixdown_reader(self) -> Bw64Reader:
-        if self._mixdown_reader is None:
-            self._mixdown_reader = Bw64Reader(self.mixdown_file_handle)
-
-        return self._mixdown_reader
-
-    @property
-    def mixdown_file_handle(self):
-        assert self.mixdown_filename
-        if self._mixdown_file_handle is None:
-            self._mixdown_file_handle = open(self.mixdown_filename, 'rb')
-
-        return self._mixdown_file_handle
-
-    @property
-    def mixdown_filename(self):
+    def mixdown_filename(self) -> str:
         if self.intermediate_filename is None:
             self.mixdown()
+        
+        assert self.intermediate_filename
 
         return self.intermediate_filename
 
@@ -102,43 +96,6 @@ class ObjectMix:
 
             unmute_all_speakers(scene)
 
-    def adm_block_formats(self, room_size=1.):
-        fps = self.scene.render.fps
-        block_formats = []
-
-        for speaker_obj in self.sources:
-            speaker_interval = speaker_active_time_range(speaker_obj)
-            for frame in range(speaker_interval.start_frame,
-                               speaker_interval.end_frame + 1):
-
-                assert self.scene.camera
-                self.scene.frame_set(frame)
-                relative_vector = compute_relative_vector(
-                    camera=self.scene.camera,
-                    target=speaker_obj)
-
-                norm_vec = room_norm_vector(
-                    relative_vector, room_size=room_size)
-
-                pos = ObjectCartesianPosition(X=norm_vec.x, Y=norm_vec.y,
-                                              Z=norm_vec.z)
-
-                if len(block_formats) == 0 or pos != block_formats[-1].position:
-                    jp = JumpPosition(
-                        flag=True, interpolationLength=Fraction(1, fps * 2))
-                    block = AudioBlockFormatObjects(position=pos,
-                                                    rtime=Fraction(frame, fps),
-                                                    duration=Fraction(1, fps),
-                                                    cartesian=True,
-                                                    jumpPosition=jp)
-
-                    block_formats.append(block)
-                else:
-                    block_formats[-1].duration = block_formats[-1].duration + \
-                        Fraction(1, fps)
-
-        return block_formats
-
     def rm_mixdown(self):
         if self._mixdown_reader is not None:
             self._mixdown_reader = None
diff --git a/intern/speaker_utils.py b/intern/speaker_utils.py
index 9580b68..e0ea597 100644
--- a/intern/speaker_utils.py
+++ b/intern/speaker_utils.py
@@ -5,6 +5,10 @@ def all_speakers(scene: bpy.types.Scene) -> list[bpy.types.Object]:
 
 
 def solo_speakers(scene: bpy.types.Scene, solo_group: list[bpy.types.Object]):
+    """
+    Mutes all Objects not in `solo_group` and ensures all objects in this group
+    are not muted.
+    """
     for speaker in all_speakers(scene):
         assert type(speaker.data) is bpy.types.Speaker
         if speaker in solo_group:
@@ -16,6 +20,9 @@ def solo_speakers(scene: bpy.types.Scene, solo_group: list[bpy.types.Object]):
 
 
 def unmute_all_speakers(scene):
+    """
+    Unmutes all speakers.
+    """
     for speaker in all_speakers(scene):
         assert type(speaker.data) is bpy.types.Speaker
         speaker.data.muted = False