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.
Ich habe aufgenommen, wie ich an meiner jacke den reißverschluss einmal auf und dann wieder zu gemacht habe. I recorded how i opened the zipper on my jacket once and then closed it again.
Recorded in home studio, you can use this effect free for your works. The sound on recorded is a zipper of a cartridge case or bag, the zipper close and open.
Sound clip of me at home "zipping up" a pencil bag, slowed down 31% and noise reduction applied. Recorded with conexant smart audio and at2020 usb microphone, processed with audacity.