Suoni e rumori

http://www.atuttalim.it/index.php/ascolta-suoni-e-rumori-discrimina-i-suoni

https://www.partnersinrhyme.com/soundfx/Ambience.shtml

https://www.youtube.com/watch?v=-XTYTDCH_Sc

http://www.suonoelettronico.com/suoni_effetti_sonori_wav.asp