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Loudness Ladder — Moderate (440 Hz)

1 s 440 Hz tone at linear amplitude 0.15 (~-16.5 dBFS peak) — rung on the Wave E loudness ladder.

File: WAV · Loudness Ladder · 1 s
Use case: Loudness / LUFSAudio analysis· Conversion set

Loudness Ladder — Near Fs (440 Hz)

1 s 440 Hz tone at linear amplitude 0.95 (~-0.45 dBFS peak) — rung on the Wave E loudness ladder.

File: WAV · Loudness Ladder · 1 s
Use case: Loudness / LUFSAudio analysis· Conversion set

Loudness Ladder — Nominal (440 Hz)

1 s 440 Hz tone at linear amplitude 0.35 (~-9.1 dBFS peak) — rung on the Wave E loudness ladder.

File: WAV · Loudness Ladder · 1 s
Use case: Loudness / LUFSAudio analysis· Conversion set

Loudness Ladder — Quiet (440 Hz)

1 s 440 Hz tone at linear amplitude 0.05 (~-26.0 dBFS peak) — rung on the Wave E loudness ladder.

File: WAV · Loudness Ladder · 1 s
Use case: Loudness / LUFSAudio analysis· Conversion set

Loudness Ladder — Silent (440 Hz)

1 s 440 Hz tone at linear amplitude 0.0 (digital silence) — rung on the Wave E loudness ladder.

File: WAV · Loudness Ladder · 1 s
Use case: Loudness / LUFSAudio analysis· Conversion set

Loudness Ladder — Very Loud (440 Hz)

1 s 440 Hz tone at linear amplitude 0.75 (~-2.5 dBFS peak) — rung on the Wave E loudness ladder.

File: WAV · Loudness Ladder · 1 s
Use case: Loudness / LUFSAudio analysis· Conversion set

Loudness Ladder — Very Quiet (440 Hz)

1 s 440 Hz tone at linear amplitude 0.02 (~-34.0 dBFS peak) — rung on the Wave E loudness ladder.

File: WAV · Loudness Ladder · 1 s
Use case: Loudness / LUFSAudio analysis· Conversion set

M4A — AAC (MP4)

The clip as AAC in an MP4/M4A container (faststart) — Apple's default audio container. For testing M4A parsing and MP4 audio conversion.

File: M4A · Codec Set · AAC-LC
Use case: Conversion testingAudio analysis· Conversion set

M4R — iPhone Ringtone

The clip as an M4R iPhone ringtone — AAC in an MP4 container with the ringtone extension. For testing that a converter maps M4R↔M4A correctly.

File: M4R · Codec Set · AAC-LC
Use case: Conversion testingAudio analysis· Conversion set

Melody — C Major Scale (WAV)

A two-second melody playing an ascending C-major scale (C4 to C5) with per-note envelopes — a simple musical signal for testing pitch detection, onset detection, and playback.

File: WAV · Signals · 2 s
Use case: Audio analysis

MP3 — CBR 192 kbps

The source clip as constant-bitrate MP3 (LAME, 192 kbps) — the most universally supported lossy audio format. For testing MP3 decoders, players, and conversion.

File: MP3 · Codec Set · MP3 (LAME)
Use case: Conversion testingAudio analysis· Conversion set

MP3 — VBR (V2)

The same clip as variable-bitrate MP3 (LAME V2) — for testing VBR handling, seeking, and duration estimation against the CBR twin.

File: MP3 · Codec Set · MP3 (LAME)
Use case: Conversion testingAudio analysis· Conversion set

MP3 with ID3 Metadata Stripped

The same MPEG audio frames with leading and trailing ID3 metadata removed, for checking metadata scrubbing without an audio transcode.

File: MP3 · Tagged
Use case: Metadata testingConversion testing· Paired fixture

MP3 with ID3 Tags and Cover Art

An MP3 with deterministic ID3v2.3 text frames and embedded PNG cover art wrapped around unchanged MPEG audio frames.

File: MP3 · Tagged
Use case: Metadata testingConversion testing· Paired fixture

Notification Chime (WAV)

A short four-note notification chime (a C-major arpeggio with a decaying final note) — a pleasant, recognisable UI sound for testing playback, short-clip handling, and notification pipelines.

File: WAV · Signals · 1 s
Use case: Audio analysis

OGG — Vorbis

The clip as Ogg Vorbis — a royalty-free lossy codec. Browser-playable; for testing Vorbis decoding and Ogg conversion.

File: OGG · Codec Set · Vorbis
Use case: Conversion testingAudio analysis· Conversion set

Opus

The clip as Opus — the modern low-latency codec used by WebRTC and streaming. Browser-playable; for testing Opus decoding and conversion.

File: OPUS · Codec Set · Opus
Use case: Conversion testingAudio analysis· Conversion set

Peak-Clip Pair 01 — Clean (220 Hz)

Clean 220 Hz tone (amp 0.45) — reference twin for the hard-clipped pair.

File: WAV · Peak Clip · 16000
Use case: Loudness / LUFSAudio analysis· Paired fixture

Peak-Clip Pair 01 — Clipped (220 Hz)

Hard-clipped twin of the 220 Hz tone (×3.2 then clip to ±1) for peak/limiter tests.

File: WAV · Peak Clip · 16000
Use case: Loudness / LUFSAudio analysis· Paired fixture

Peak-Clip Pair 02 — Clean (440 Hz)

Clean 440 Hz tone (amp 0.45) — reference twin for the hard-clipped pair.

File: WAV · Peak Clip · 16000
Use case: Loudness / LUFSAudio analysis· Paired fixture

Peak-Clip Pair 02 — Clipped (440 Hz)

Hard-clipped twin of the 440 Hz tone (×3.2 then clip to ±1) for peak/limiter tests.

File: WAV · Peak Clip · 16000
Use case: Loudness / LUFSAudio analysis· Paired fixture

Peak-Clip Pair 03 — Clean (880 Hz)

Clean 880 Hz tone (amp 0.45) — reference twin for the hard-clipped pair.

File: WAV · Peak Clip · 16000
Use case: Loudness / LUFSAudio analysis· Paired fixture

Peak-Clip Pair 03 — Clipped (880 Hz)

Hard-clipped twin of the 880 Hz tone (×3.2 then clip to ±1) for peak/limiter tests.

File: WAV · Peak Clip · 16000
Use case: Loudness / LUFSAudio analysis· Paired fixture

Peak-Clip Pair 04 — Clean (660 Hz)

Clean 660 Hz tone (amp 0.45) — reference twin for the hard-clipped pair.

File: WAV · Peak Clip · 16000
Use case: Loudness / LUFSAudio analysis· Paired fixture