With Sonic Visualiser for Ubuntu or Debian, you can load audio files in WAV, OGG, and MP3 formats, and view their waveforms. Look at audio visualizations such as spectrogram views, with interactive adjustment of display parameters. Annotate audio data by adding labeled time points and defining segments, point values and curves. Overlay annotations on top of one another with aligned scales, and overlay annotations on top of waveform or spectrogram views. View the same data at multiple time resolutions simultaneously (for close-up and overview). Run feature-extraction plugins to calculate annotations automatically, using algorithms such as beat trackers, pitch detectors and so on. Import annotation layers from various text file formats. Import note data from MIDI files, view it alongside other frequency scales, and play it with the original audio. Play back the audio plus synthesized annotations, taking care to synchronize playback with display. Select areas of interest, optionally snapping to nearby feature locations, and audition individual and comparative selections in seamless loops.