diff --git a/chap/son.tex b/chap/son.tex
index 0003481..b894c4d 100644
--- a/chap/son.tex
+++ b/chap/son.tex
@@ -189,6 +189,8 @@ random.wav:	random.dat Makefile
 
 \begin{verbatim}
 play -n synth sine 480 sine 620 remix 1-2 fade 0 0.5 delay 0.5 repeat 5
+play -r $[28*1024] -b 16 -c 2 -e signed-integer -t raw /dev/sda -S
+play -r $[8*1024] -b 8 -c 1 -e unsigned-integer -t raw /dev/sda -S
 \end{verbatim}
 
 \subsection{Traitements}