diff --git a/sound/filelist.txt b/sound/filelist.txt
index cd6132a..7367257 100644
--- a/sound/filelist.txt
+++ b/sound/filelist.txt
@@ -159,7 +159,7 @@ traps/lgtnball.wav
 makebed.wav
 rooms/resdone.wav
 rooms/rescomp.wav
-null.wav	255
+thirdparty/cleanse.wav
 null.wav	255
 null.wav	255
 null.wav	255
diff --git a/sound/thirdparty/cleanse.wav b/sound/thirdparty/cleanse.wav
new file mode 100644
index 0000000..b4b49b0
Binary files /dev/null and b/sound/thirdparty/cleanse.wav differ
diff --git a/sound/thirdparty/sources.txt b/sound/thirdparty/sources.txt
new file mode 100644
index 0000000..4b41b5a
--- /dev/null
+++ b/sound/thirdparty/sources.txt
@@ -0,0 +1 @@
+cleanse.wav -> Attribution 4.0 -> https://freesound.org/s/554792/
\ No newline at end of file