AmpKit works with virtually all iOS-compatible digital guitar interfaces, that connect to the 30-pin or Lightning ports of your device.
AmpKit LiNK HD is a pure digital guitar interface that connects to the 30-pin or Lightning port (using Apple's Lightning to 30-pin Adapter) on your iOS device.
LiNK HD is compatible with all newer iOS devices including iPad, iPad 2, iPad (3rd generation), iPad (4th generation), iPad Air, iPad mini, iPad mini Retina, iPhone 4, iPhone 4S, iPhone 5, iPhone 5S and iPod touch (4th and 5th generation).
Agile used LiNK HD exclusively at NAMM 2013, with great results. Our NAMM audio setup: a preview version of AmpKit 1.6 with stereo support running on iPad 4, iPad mini, MacBook Air, and iMac, connected to AmpKit LiNK HD, then via LiNK HD's Line Out jack stereo into a 10-channel Peavey mixer, and finally on to a pair of 1200W Peavey Impulse 12D powered enclosures with amazing-sounding ribbon drivers. We had LiNK HD's AC power adapter connected, so the iPads stayed charged all through the long NAMM show days.
Here's Alex Skolnick showing off AmpKit and LiNK HD in stereo: