A sound record (4)
I believe the answer is:
note
I believe this clue is a double definition.
'a sound' is the first definition.
(thesaurus)
'record' is the second definition.
(note can mean to record or notate)
(Other definitions for note that I've seen before include "Consequence" , "Memo; tone" , "Memo - sound - fame" , "Brief letter - distinction" , "Quaver, say" .)