--- a/audio.rst	Thu Jul 19 14:21:14 2012 +0300
+++ b/audio.rst	Tue Jul 31 22:26:37 2012 +0300
@@ -12,6 +12,25 @@
  * http://wiki.debian.org/ALSA
  * http://wiki.debian.org/SoundFAQ
 
+Test speaker and microphone.
+============================
+
+To configure audio devices::
+
+  $ alsamixer
+
+To hier voice from mic in speaker::
+
+  $ arecord | aplay
+  $ arecord -f cd | aplay -f cd
+
+To list of available devices::
+
+  $ aplay -l
+  $ aplay -L
+  $ arecord -l
+  $ arecord -L
+
 Suitable convertors?
 ====================
 ::