diff --git a/csdr/chain/drm.py b/csdr/chain/drm.py
index 7aa58ebb..78b90f0d 100644
--- a/csdr/chain/drm.py
+++ b/csdr/chain/drm.py
@@ -6,7 +6,11 @@ from csdr.module.drm import DrmModule
 
 class Drm(BaseDemodulatorChain, FixedIfSampleRateChain, FixedAudioRateChain):
     def __init__(self):
-        workers = [Convert(Format.COMPLEX_FLOAT, Format.COMPLEX_SHORT), DrmModule(), Downmix()]
+        workers = [
+            Convert(Format.COMPLEX_FLOAT, Format.COMPLEX_SHORT),
+            DrmModule(),
+            Downmix(Format.SHORT),
+        ]
         super().__init__(workers)
 
     def supportsSquelch(self) -> bool:
diff --git a/docker/scripts/install-owrx-tools.sh b/docker/scripts/install-owrx-tools.sh
index 0c9db6d9..231f5919 100755
--- a/docker/scripts/install-owrx-tools.sh
+++ b/docker/scripts/install-owrx-tools.sh
@@ -32,13 +32,13 @@ popd
 rm -rf js8py
 
 git clone https://github.com/jketterl/csdr.git
-# latest develop as of 2023-09-08 (execmodule improvements)
-cmakebuild csdr 764767933ed2b242190285f8ff56b11d80c7d530
+# latest develop as of 2024-01-22 (downmix format)
+cmakebuild csdr e6ae546a6a1d3fd052fe962eb5a04fd33e794214
 
 git clone https://github.com/jketterl/pycsdr.git
 cd pycsdr
-# latest develop as of 2023-08-21 (death of CallbackWriter))
-git checkout 77b3709c545f510b52c7cea2e300e2e1613038e2
+# latest develop as of 2024-01-22 (downmix format)
+git checkout c7dafe83d08b74012e233502dff0bc6e6f17c01c
 ./setup.py install install_headers
 cd ..
 rm -rf pycsdr