Hello All. Apps are the rage now a days, and I just stumbled across the Peavey AmpKit Link for iPhone, iPad and iPod Touch. The link is the headphone and guitar input interface and is used to connect to your Apple device. Peavey Ampkit is a free app where you can play various effects, changes amps/cabinets and record ideas or play along with backing tracks, etc.
Here is the official description:
Peavey Electronics and leading iPhone applications developer Agile Partners have joined forces to launch AmpKit, an unparalleled guitar amp and effects iPhone application, and AmpKit LiNK, a high fidelity audio interface for the iPhone, iPod touch* and iPad. Together, AmpKit and AmpKit LiNK provide musicians of all skill levels with a powerful and convenient way to jam with high quality tones anytime and anywhere.
Peavey AmpKit LiNK
The AmpKit LiNK audio interface raises the audio fidelity bar for the iPhone platform. AmpKit LiNK is an iPhone, iPod touch* and iPad interface for electric guitar, bass, or any line level source, with an output that can be connected to headphones, powered speakers or a PA.
Unlike unpowered guitar interfaces that suffer from feedback when using headphones, AmpKit Link is a powered device with circuitry that virtually eliminates feedback. AmpKit Link is the first guitar interface that was specifically designed to provide solutions for the iPhone platform.
I found this great demo video as well: