Audacity is great, but it’s a GUI and sometimes I just want to do basic things like amplify the sound of some mp3 files. Discovered mp3gain from this thread and wrote this script to batch amplify the files:
<pre class="src src-sh"><span style="color: #ff4500;">#</span><span style="color: #ff4500;">! /bin/</span><span style="color: #00ffff;">bash</span>
gainval=10 for file in “$@” do mp3gain -g $gainval $file done
Note that mp3gain alters the original mp3 files directly. My default value is 10; feel free to alter it.