diff --git a/v0.5/4-demos/04_sound/O-ESD_demo_04_sound.mp4 b/v0.5/4-demos/04_sound/O-ESD_demo_04_sound.mp4 deleted file mode 100644 index 91e0191..0000000 Binary files a/v0.5/4-demos/04_sound/O-ESD_demo_04_sound.mp4 and /dev/null differ