...no, si al final habrá que comprarse uno:
http://www.studiosixdigital.com/products_2.html
http://acousticsoftwarereviews.com/review/iphone/audiotools-1-1-for-iphone-review/
(http://acousticsoftwarereviews.com/wp-content/uploads/IMG_0142.PNG) (http://acousticsoftwarereviews.com/wp-content/uploads/IMG_0143.PNG)
(http://acousticsoftwarereviews.com/wp-content/uploads/IMG_0155.PNG) (http://acousticsoftwarereviews.com/wp-content/uploads/IMG_0170.PNG)
Saludos, Raúl
Yo uso el SPL Meter con cierta frecuencia ;)