01A small test prevents a misprepared batch.
Use an empty test card and three clearly distinguishable audio files. Read the player instructions, turn shuffle off and record the actual order. Change only one property at a time so the result can be traced.
| Test | Example | Observe |
|---|---|---|
| File names | 001_Start, 002_Middle, 003_End | Does the player follow the names? |
| Track metadata | Different track numbers in stored metadata | Does the order change? |
| Folders | One shared folder or separate folders | Which folder rule does the player use? |
| Restart | Restart according to the manufacturer's instructions | Does the order stay the same? |
02Numbering helps only if the player sorts by it.
Consistent names such as 001, 002 and 010 may help alphabetical sorting; they are not a universal guarantee. Do not delete metadata indiscriminately: some players need it. Record the rule confirmed by testing.
03Approval requires more than audible sound.
Check the beginning, middle and end, folder changes and restart. Correct order is part of the function of learning materials and spoken instructions; a correctly copied file can play in the wrong place. Remove the card only if the device permits it, following the manufacturer's instructions. Test removal separately from restart.
04Keep the approved structure for batch deliveries.
Save the approved folders with a version and the tested device model. Retest playback after firmware, file-name or metadata changes. This provides a traceable specification for the next delivery.
Playback approval
A worksheet for your own records, not a submitted request.