diff --git a/Earthfile b/Earthfile
index 85a6ccf..ba35b23 100644
--- a/Earthfile
+++ b/Earthfile
@@ -44,9 +44,13 @@ avsync-video-components:
     RUN pnpm av:render:audio -i beep.wav -o /var/tmp/track.wav --repeats $CYCLES
     SAVE ARTIFACT /var/tmp/track.wav
 
-avsync-video:
+aux-media:
     FROM debian:bookworm
-    RUN apt-get update && apt-get install -y ffmpeg && rm -rf /var/lib/apt/lists/*
+    RUN apt-get update && apt-get install -y ffmpeg sox && rm -rf /var/lib/apt/lists/*
+
+avsync-video:
+    FROM +aux-media
+    RUN apt-get update && apt-get install -y ffmpeg sox && rm -rf /var/lib/apt/lists/*
     COPY +avsync-video-components/track.wav /track.wav
     COPY +avsync-video-components/frames /frames
     RUN find frames -type f | sort | xargs -I {} sh -c 'echo "file {}" >> /frames.txt'
@@ -57,11 +61,12 @@ avsync-video:
     SAVE ARTIFACT avsync.webm
 
 audio-channel-tracks:
-    FROM debian:bookworm
-    RUN apt-get update && apt-get install -y ffmpeg && rm -rf /var/lib/apt/lists/*
-    RUN mkdir -p /output
-    COPY assets/audio/channels /channels
-    WORKDIR /channels
+    FROM +aux-media
+    RUN mkdir -p /input /output
+    COPY assets/audio/channels /raw
+    WORKDIR /raw
+    RUN for file in *.wav; do sox $file /input/$file silence 1 0.1 0.1% reverse silence 1 0.1 0.1% reverse; done
+    WORKDIR /input
     RUN mkdir -p /output/wav/stereo /output/wav/5.1 /output/wav/7.1
     RUN ffmpeg -i Left.wav -af "pan=stereo|FL=c0" /output/wav/stereo/Left.wav -hide_banner -loglevel error && \
         ffmpeg -i Right.wav -af "pan=stereo|FR=c0" /output/wav/stereo/Right.wav -hide_banner -loglevel error && \