sonic-visualiser (audio file visualiser)

Sonic Visualiser is an application for viewing and analysing the contents
of music audio files. The aim of Sonic Visualiser is to be the first
program you reach for when want to study a musical recording rather than
simply listen to it.

Optional dependencies, detected at build time:

portaudio - allows sonic-visualiser to run without a JACK or pulseaudio
server (using plain ALSA).

jack - allows sonic-visualiser to use JACK for realtime audio
recording/playback [*].

liblo - allows remote control of sonic-visualiser via OSC.

Note: PulseAudio seems to work but hasn't been thoroughly tested. If you
have problems with the other audio I/O backends, try JACK. See File ->
Preferences -> Audio I/O.

[*] When built with jack, this package uses POSIX filesystem capabilities
to execute with elevated privileges (required for realtime audio
processing). This may be considered a security/stability risk. Please
read http://www.slackbuilds.org/caps/ for more information. To disable
capabilities, pass SETCAP=no to the script, or build without JACK.