These two mono 16-bit PCM 22,050 Hz WAVs are generated from scratch by generate_assets.py. They use pure sine tones at two pitches, not recorded voices, instruments, songs, cultural motifs or a demonstration of instrumental timbre. File timing can be audited mechanically, but audio is not cleared for classroom playback until an educator listens to each candidate at a comfortable level on intended equipment, checks room/device behaviour and offers a complete no-sound route. No child voice or data is recorded.
Four beat places per phrase are separated by 0.5 seconds. Start of phrase 1 is 0.10 s; phrase 2 starts 2.10 s. Every short event lasts 0.10 s. Rest cells have no synthesized event. The file has a silent tail through 4.20 s. These timings describe the file only; they do not demand a child copy its pace.
| Candidate | Exact event transcript | Complete no-sound route |
|---|---|---|
| cue-o-two-turns.wav | Circle/T: local X1 at 0.10 s, REST2 at 0.60 s, X3 at 1.10 s, REST4 at 1.60 s, all 330 Hz. Triangle/T′: X1 at 2.10 s, REST2 at 2.60 s, REST3 at 3.10 s, REST4 at 3.60 s, the one event 440 Hz. Thus two events then one. | B and E: fixed T then T′ cards with distinct circle/triangle labels; count three planned events without hearing. |
| cue-p-echo-then-answer.wav | Circle/T: X1 at 0.10 s, REST2 at 0.60 s, X3 at 1.10 s, REST4 at 1.60 s, 330 Hz. Triangle/U: REST1 at 2.10 s, X2 at 2.60 s, REST3 at 3.10 s, X4 at 3.60 s, 440 Hz. Thus two events then two, with contrasting placement. This is a practice cue, not Check P's fresh V source. | D: compare T then U on fixed raised four-cell strips; describe the first rest and event places by pointing, AAC or neutral read-aloud. |
Human review needed: listen for clipping, sharpness, speaker artefacts, comfortable level and any unintended resemblance on the actual classroom system; document educator/date/device decision outside this pack. The included exact transcript plus quiet printed route means no learner must hear either file. Hearing or pitch recognition cannot be inferred from simply opening the file.