Turn a machine recording into an observation log

Analyse the user-provided [RECORDING] of [MACHINE] and produce a timestamped observation log. Describe rhythm, pitch, pauses, background interference and changes without naming a fault unless the manufacturer evidence [REFERENCE] supports it. Provide a short spoken summary that a technician could understand, plus questions about operating state and recording conditions. Do not recommend unsafe testing or operation. If the file cannot be heard, state that and give a capture checklist. Check that every observation has a timestamp and that possible causes are explicitly labelled hypotheses.