diff --git a/pages/common/play.md b/pages/common/play.md
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+# play
+
+> Audio player of SoX - Sound eXchange
+> Plays any audio from the command line
+> Audioformats are identified by extension
+
+- Play the given audio file
+
+`play {{audiofile}}`
+
+- Play the given audio files
+
+`play {{audiofile1}} {{audiofile2}}`
+
+- Play the given audio at twice the speed
+
+`play {{audiofile}} speed 2.0`
+
+- Play the given audio in reverse
+
+`play {{audiofile}} reverse`
+
+
diff --git a/pages/common/sox.md b/pages/common/sox.md
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+# sox
+
+> SoX - Sound eXchange
+> Play, record and convert audio files
+> Audioformats are identified by extension
+
+- Merge two audio files into one
+
+`sox -m {{audiofile1}} {{audiofile2}} {{output_filename}}`
+
+- Trim an audio file to the specified time indecies
+
+`sox {{input_audiofile}} {{output_audiofile}} trim {{start}} {{end}}`
+
+- Normalize an audio file
+
+`sox --norm {{input_audiofile}} {{output_audiofile}}`
+
+- Reverse and save audio file
+
+`sox {{input_audiofile}} {{output_audiofile}} reverse`
+
+- Print statistical data of the audio file
+
+`sox {{audiofile}} -n stat`