According to Gibson, the Digital Amp can be used without the need for any guitar cables, and Gibson App users can make the most of the virtual tones with just a pair of headphones.
Instead, the app listens to your playing via the mic on your iPhone/iPad, then amplifies the sound through the headphones applying whatever tone-tweaking tools have been selected on the way.
This is the same technology the app utilizes in order to provide its real-time feedback when players are engaged in lessons. Gibson also says players can connect their guitars with an audio interface to “get an improved sound”.