I mean without the aid of software. I'm trying to write an article in response to claims of "EVP" being infrasound or ultrasound. I realize that is you change the speed of the playback, it would allow you to hear the sounds, but i wondered if the device itself (analog or digital) altered it in...
Is it possible for consumer grade recording devices to record sounds outside of the human hearing range, but be audible upon playback? In other words, is it possible for recording devices to alter frequencies in any way?