diff -r bc3de0d9061a -r b5bc03faed27 audio.rst
--- a/audio.rst	Tue Dec 30 12:59:31 2014 +0200
+++ b/audio.rst	Tue Dec 23 20:40:22 2014 +0200
@@ -42,6 +42,18 @@
   $ play -n synth sin 440 vol -40dB
   $ play -n synth 10 square 100-10000 synth sin fmod 100 vol -40dB
 
+Check HDA params.
+=================
+::
+
+  $ sudo apt-get install alsa-tools-gui
+  $ hdajackretask
+
+See also:
+
+  http://www.alsa-project.org/main/index.php/HDA_Analyzer
+    provides a graphical interface to access the raw HD-audio control
+
 Suitable convertors?
 ====================
 ::