- Sonic Visualiser is a free, open-source application for Windows, Linux, and Mac, designed to be the first program you reach for when want to study a music recording closely. It's designed for musicologists, archivists, signal-processing researchers, and anyone else looking for a friendly way to look at what lies inside the audio file.
Install the package.
$ apulse sonic-visualiser
The terminal messages will still have
WARNING: AudioFactory::createCallbackIO: Failed to open JACK I/O but can be ignored, audio will play with no issues.