diff --git a/sound_objects/intern/generate_adm.py b/sound_objects/intern/generate_adm.py
index 74c6b97..7a864f9 100644
--- a/sound_objects/intern/generate_adm.py
+++ b/sound_objects/intern/generate_adm.py
@@ -6,6 +6,7 @@ import lxml
 import uuid
 from fractions import Fraction
 import struct
+from os.path import dirname
 
 import numpy
 
@@ -22,33 +23,15 @@ from ear.fileio.adm.xml import adm_to_xml
 from ear.fileio.adm.builder import (ADMBuilder)
 from ear.fileio.adm.generate_ids import generate_ids
 
-from sound_objects.intern.geom_utils import (speaker_active_time_range,
+from .geom_utils import (speaker_active_time_range,
                                              speakers_by_min_distance,
                                              speakers_by_start_time)
 
-from sound_objects.intern.object_mix import (ObjectMix, ObjectMixPool)
+from .object_mix import (ObjectMix, ObjectMixPool, object_mixes_from_source_groups)
 
-from sound_objects.intern.speaker_utils import (all_speakers)
+from .speaker_utils import (all_speakers)
 
 
-@contextmanager
-def adm_object_rendering_context(scene: bpy.types.Scene):
-    old_ff = scene.render.image_settings.file_format
-    old_codec = scene.render.ffmpeg.audio_codec
-    old_chans = scene.render.ffmpeg.audio_channels
-
-    scene = bpy.context.scene
-
-    scene.render.image_settings.file_format = 'FFMPEG'
-    scene.render.ffmpeg.audio_codec = 'PCM'
-    scene.render.ffmpeg.audio_channels = 'MONO'
-
-    yield scene
-
-    scene.render.image_settings.file_format = old_ff
-    scene.render.ffmpeg.audio_codec = old_codec
-    scene.render.ffmpeg.audio_channels = old_chans
-
 
 def group_speakers(speakers, scene) -> List[List[bpy.types.Object]]:
     def list_can_accept_speaker(speaker_list, speaker_to_test):
@@ -218,7 +201,10 @@ def generate_adm(context: bpy.types.Context, filepath: str, room_size: float, ma
     if len(object_groups) == 0:
         return {'FINISHED'}
 
-    with ObjectMixPool.pool_from_source_groups(object_groups) as pool:
+    mix_groups = object_mixes_from_source_groups(object_groups, 
+                            scene=scene, base_dir=dirname(filepath))
+
+    with ObjectMixPool(object_mixes=mix_groups) as pool:
         mux_adm_from_object_mix_pool(scene, mix_pool=pool,
                                      output_filename=filepath,
                                      room_size=room_size)
diff --git a/sound_objects/intern/geom_utils.py b/sound_objects/intern/geom_utils.py
index 89c04e7..21104d0 100644
--- a/sound_objects/intern/geom_utils.py
+++ b/sound_objects/intern/geom_utils.py
@@ -1,9 +1,12 @@
 import sys
 from math import sqrt
 
+import bpy
+
 import numpy
 from numpy.linalg import norm
 
+from mathutils import Vector, Quaternion
 
 class FrameInterval:
     def __init__(self, start_frame, end_frame):
diff --git a/sound_objects/intern/object_mix.py b/sound_objects/intern/object_mix.py
index 8af599a..251f4b6 100644
--- a/sound_objects/intern/object_mix.py
+++ b/sound_objects/intern/object_mix.py
@@ -7,9 +7,27 @@ from typing import List
 from ear.fileio.adm.elements import ObjectCartesianPosition, JumpPosition, AudioBlockFormatObjects
 from ear.fileio.bw64 import Bw64Reader
 
-from sound_objects.intern.generate_adm import adm_object_rendering_context
-from sound_objects.intern.geom_utils import speaker_active_time_range, compute_relative_vector, room_norm_vector
-from sound_objects.intern.speaker_utils import solo_speakers, unmute_all_speakers
+from .geom_utils import speaker_active_time_range, compute_relative_vector, room_norm_vector
+from .speaker_utils import solo_speakers, unmute_all_speakers
+
+
+@contextmanager
+def adm_object_rendering_context(scene: bpy.types.Scene):
+    old_ff = scene.render.image_settings.file_format
+    old_codec = scene.render.ffmpeg.audio_codec
+    old_chans = scene.render.ffmpeg.audio_channels
+
+    scene = bpy.context.scene
+
+    scene.render.image_settings.file_format = 'FFMPEG'
+    scene.render.ffmpeg.audio_codec = 'PCM'
+    scene.render.ffmpeg.audio_channels = 'MONO'
+
+    yield scene
+
+    scene.render.image_settings.file_format = old_ff
+    scene.render.ffmpeg.audio_codec = old_codec
+    scene.render.ffmpeg.audio_channels = old_chans
 
 
 class ObjectMix:
@@ -115,21 +133,14 @@ class ObjectMix:
             self._mixdown_file_handle.close()
             self._mixdown_file_handle = None
 
-        os.remove(self.intermediate_filename)
-        self.intermediate_filename = None
+        if self.intermediate_filename is not None:
+            os.remove(self.intermediate_filename)
+            self.intermediate_filename = None
 
 
-@contextmanager
+#@contextmanager
 class ObjectMixPool:
 
-    @classmethod
-    def pool_from_source_groups(cls, groups: List[List[bpy.types.Speaker]]):
-        mixes = []
-        for group in groups:
-            mixes.append(ObjectMix(sources=group))
-
-        return ObjectMixPool(object_mixes=mixes)
-
     def __init__(self, object_mixes: List[ObjectMix]):
         self.object_mixes = object_mixes
 
@@ -142,5 +153,13 @@ class ObjectMixPool:
 
     @property
     def shortest_file_length(self):
-        lengths = map(lambda f: len(f.mixdown_reader))
+        lengths = map(lambda f: len(f.mixdown_reader), self.object_mixes)
         return min(lengths)
+
+
+def object_mixes_from_source_groups(groups: List[List[bpy.types.Speaker]], scene, base_dir):
+    mixes = []
+    for group in groups:
+        mixes.append(ObjectMix(sources=group, scene=scene, base_dir=base_dir))
+
+    return mixes