AmpKit, the killer amp sim app by Agile Partners, has just been updated to feature Retina display resolution as well as a few new gear models: the Trace Elliot 1215 bass amp, Rocktron Metal Planet Distortion and Rocktron HUSH Noise Reduction. And save 33-40% on new gear and 50% on AmpKit+ for a limited time.

Agile, of course, also recently announced AmpKit Link HD, an incredible new iOS interface which not only captures your guitar sound in higher fidelity than before, but also allows you to charge your iPad while still using it for your amp sim. Here’s a great video of Kenny Wayne Shepherd demonstrating AmpKit (and talking up the great Guitar World Lick Of The Day app) at NAMM 2012.

Y’know, I feel slightly embarrassed because at first I didn’t really like AmpKit. But then I got a few new, high quality interfaces (the Line 6 Mobile In and the Sonoma Wire Works GuitarJack Model 2, both of which I’ll review very soon), and the app really came alive. And now I enjoy the hell out of it. So I can only imagine how much ass it will kick once AmpKit Link HD is out.