Update cheatsheets

sox

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# sox
+
+> Sound eXchange: play, record and convert audio files.
+> Audio formats are identified by the extension.
+> More information: <http://sox.sourceforge.net>.
+
+- Merge two audio files into one:
+
+`sox -m {{path/to/input_audio1}} {{path/to/input_audio2}} {{path/to/output_audio}}`
+
+- Trim an audio file to the specified times:
+
+`sox {{path/to/input_audio}} {{path/to/output_audio}} trim {{start}} {{end}}`
+
+- Normalize an audio file (adjust volume to the maximum peak level, without clipping):
+
+`sox --norm {{path/to/input_audio}} {{path/to/output_audio}}`
+
+- Reverse and save an audio file:
+
+`sox {{path/to/input_audio}} {{path/to/output_audio}} reverse`
+
+- Print statistical data of an audio file:
+
+`sox {{path/to/input_audio}} -n stat`
+
+- Increase the volume of an audio file by 2x:
+
+`sox -v 2.0 {{path/to/input_audio}} {{path/to/output_audio}}`