http://www.head-fi.org/t/595071/android-phones-and-usb-dacs/270#post_8660606

A standard USB DAC operates only as a USB peripheral. It only interworks with a USB host.

The SGS3 is a USB On-The-Go device. A USB OTG device can act as a USB host or as a USB peripheral.

Simply put, a USB OTG device, like the SGS3, acts as . a USB peripheral when a Micro-B plug is inserted [regular cable] . a USB host when a Micro-A plug is inserted [“OTG cable”]

http://www.head-fi.org/t/595071/android-phones-and-usb-dacs/150#post_8530235

Android phones and USB DACs - Page 11

http://www.knowyourcell.com/news/1536735/samsung_galaxy_s3_30_tips_and_tricks.html

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