I was roaming the isles at NAMM and came across a demonstration for what quickly became a must-have electric guitar application for my iTouch.

The PRS JAM AMP combines a great-sounding guitar amp simulator, a backing track audio file player and a super-accurate tuner into an all-around first class application that allows me to jam along to backing tracks and slow down riffs and solos for optimal practice — all through my mobile device and the privacy of my headphones.

The PRS JAM AMP lets you load, loop and slow down audio clips for repeated practice of those tricky parts. Upload and play back popular riffs and songs in MP3, ACC (unprotected) or AIIF formats using the onboard web interface.

You can even adjust the tuning of your audio tracks to your guitar. For example, if the backing track was recorded in the key of C#… you can adjust the pitch upward by three tones and play along on your guitar in E!  That means any track can be played in your favorite key!

The amp application includes the standard tone controls as well as input boost, reverb and crunch (overdrive). There is even a slider to adjust for room size.

As far as I am concerned, this is the ultimate iPhone-iTouch application. I can walk around in my house with my Les Paul strapped on and my iTouch in my pocket. The optional (but required) Guitarbud cable that connects my iTouch to my Guitar and headphones is neatly tucked in my back pocket and I am jamming along (walking room-to-room) to a backing track — all the while listening to everything through my headphones.

The best part is…. I am playing LOUD… and my wife hears nothing!

Whether you’re practicing, recording your latest idea, or just killing time, true inspiration and killer tone is finally as close as your iPhone or iTouch.