Hi @[deleted] Ghoul,
Thanks for the link, this would be a lot harder without it.
Long story short, the specific format of MP3 used isn't decoded properly in VideoPad (I've filed a bug report with the audio team at NCH). To work around this, I'd recommend using Audacity (or similar software) to convert it from mp3 to a WAV file, and then you can import that into VideoPad.
Sorry for any inconvenience!