The materials explicitly state that no keys or environment variables are required, and the README does not request any API keys, account tokens, or other sensitive credentials; no clear credential leakage or abuse surface is evident.

The materials list no remote host endpoints, and the README describes only local audio processing to generate images; it does not indicate sending user audio, metadata, or outputs to external services, so no network egress is apparent.

The system marks it as prompt-only, and the documentation only shows CLI usage and flags; there is no stated capability for arbitrary code execution, starting extra system services, or expanding system privileges. The note that other formats use ffmpeg 'if available' appears to be an optional local dependency rather than an additional remote execution surface.

Per the documentation, the tool reads user-supplied local audio files or stdin and writes visualization results to local output files; this is normal local data access for its stated function, and no excessive access beyond audio input and image output is described.

The source is an open-source GitHub repository with very high community adoption (about 377k stars), and the code is in principle auditable; these are strong risk-reducing signals. The license is undeclared and maintenance status is unknown, but the current materials do not justify a higher-risk rating on that basis alone.