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diff --git a/xgui/doc/sound/09_more_physics3.pd b/xgui/doc/sound/09_more_physics3.pd
new file mode 100644
index 00000000..d12a12d3
--- /dev/null
+++ b/xgui/doc/sound/09_more_physics3.pd
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diff --git a/xgui/doc/sound/09_more_physics4.pd b/xgui/doc/sound/09_more_physics4.pd
new file mode 100644
index 00000000..c037e56c
--- /dev/null
+++ b/xgui/doc/sound/09_more_physics4.pd
@@ -0,0 +1,219 @@
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new file mode 100644
index 00000000..d4a6b392
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