These short mono 16-bit PCM 22,050 Hz WAVs are generated from scratch. LOW is a pure 330 Hz tone and HIGH a pure 495 Hz tone, each 0.10 seconds. Event starts are 0.10, 0.60, 1.10 and 1.60 seconds; the file lasts 2.40 seconds with silence after the last short tone. Both tones have the same programmed digital amplitude, which does not guarantee equal perceived loudness on a device. This is an invented relative pair, not an instrument, song, cultural melody, standard note-naming lesson or required vocal range. Timing describes these files, not a pace a child must copy.
All files are candidate, not cleared for classroom use until a human educator listens, checks comfortable volume and actual speaker behaviour on the intended equipment, and offers a complete no-sound route. No child voice or data is captured, and no autoplay is built in.
| Candidate | Exact event transcript | Complete quiet route |
|---|---|---|
| cue-a-hold-rise.wav (playback review held) | Place 1 at 0.10 s LOW 330 Hz; 2 at 0.60 s LOW 330 Hz; 3 at 1.10 s HIGH 495 Hz; 4 at 1.60 s HIGH 495 Hz. Four separate 0.10 s events, with quiet gaps. Direction SAME / UP / SAME. | A two-rail sheet: four broad LOW/LOW/HIGH/HIGH cards on fixed rails, then three SAME/UP/SAME join cards. |
| cue-b-zigzag.wav (playback review held) | 0.10 s LOW 330 Hz; 0.60 s HIGH 495 Hz; 1.10 s LOW 330 Hz; 1.60 s HIGH 495 Hz. Four separate 0.10 s events and quiet gaps. Direction UP / DOWN / UP. | B two-rail sheet: trace four marks and three joins by raised level or neutral read-aloud. |
| cue-d-arch.wav (playback review held) | 0.10 s LOW 330 Hz; 0.60 s HIGH 495 Hz; 1.10 s HIGH 495 Hz; 1.60 s LOW 330 Hz. Four separate 0.10 s events and quiet gaps. Direction UP / SAME / DOWN. | D arch sheet: LOW/HIGH/HIGH/LOW on fixed rails and three direction cards. |
The educator's review checks sharpness, distortion, level, speaker artefacts and class comfort. Keep the quiet route available after any approval. Opening a file does not demonstrate a child heard the pitch difference, could reproduce it or wanted to hear it.