Audio inspector
Sonic Lens
Press scan. See the wave you cannot hear — silent 17 kHz tones, a 17 Hz sonic, or quiet words riding under the music.
Drop a song, or press Scan and pick a file
Try a known mix
How to catch a hidden wave
A second track can sit on music and sound like nothing. Three common hides: a 17 Hz sonic you feel more than hear, a 17.4 kHz silent tone most adults miss, and quiet words mixed out of phase so they cancel in a car.
Track scan reads the file itself — best for 17 kHz, because the original mix still has those frequencies.
Room scan uses the mic. Play the song, hold the phone by the speaker (house stereo, car Bluetooth, earbuds on the table), stay quiet for eight seconds. Bluetooth often strips ultrasonics; if the file alerts and the room does not, the speaker never played the silent tone.
Play hidden layer boosts left-minus-right and any high-tone envelope so a buried whisper becomes audible. Read hidden layer tries to turn that into words.
This is a spectrum and phase check of audio you choose to scan — not a wiretap. Phone mics rarely hear below ~40 Hz or above ~16 kHz. File scan of the original track is the complete picture.