Opening or closing a zipper on a backpack, recorded using a self written app on my samsung galaxy phone, converted from mpeg v4 to mp3 using online-audio-converter. Com.
I unlock the front door, then leave it open to hear the ambient sound from outside, then i close it. Recorded with zoom h5 recorder (xyh-5)october 22, 2018.
This sound was recorded at the campus of poblenou of the pompeu fabra university in the corridor linking the cafeteria with the tanger building. Noise makes to open and close the glass door that connects the hall of the café with the passage that leads to the tanger building. This recording has greater duration than the glass door noise 1.