Terminal waveform visualization

[systemblueteam]

Draw waveforms in the terminal using Unicode block characters (▁▂▃▄▅▆▇█). Two waveforms stacked, one per file, with time axis. Color-code differing segments. Auto-scale to terminal width.

Goes between metadata and loudness in the default report.

[coderabbitai]

🔗 Related PRs

#31 - Fix duplicate terminal output and spectral delta overflow [closed]
#40 - feat: add rich progress bar for long audio files (#30) [closed]

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