Just load up greySox String Trio, choose a bit of classical music, and press “play”. The music loads in and plays based on the strokes of the virtual “bow” that is your iPhone or iPod Touch. String Trio uses the motion sensor in your iPhone to detect the angle and length of your strokes, and adjusts the playback of the music accordingly. You can either choose automatic accompaniment (hence the “trio” part of the name), or perform a solo without any backing instruments. The video below should give you a pretty good idea of how it works.

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I don’t know about you, but that Beethoven demo track sort of sounded like the theme from Fawlty Towers to me. They really should add that one to the app and they’d sell a lot more copies. For now, you’ll have to settle for one of the over 20 included classical and folks songs bundled with the App. greySox is also offering in-app downloads of two additional 10-track collections, priced at 99 cents each.

String Trio is available now over at the iTunes App Store for $1.99 (USD).

Originally a one-of-a-kind guitar mod designed by a guy going by the name A4AJ, it’s now available as a (patent-pending) kit you can install on your own guitar.

Click to View Embedded Video Clip

The kit includes everything you need to swap out the plastic bar with a playable string, special strum switch, along with several metal strings, springs and even a Fender guitar pick. Yep, with this mod in place and the tension cranked up, you can play the guitar with a pick!

Keep in mind that the kit does not include the guitar or the wood backboard, and requires that you perform some fairly significant surgery (Dremel, drilling and soldering) on your stock Stratocaster — obviously voiding your warranty.

The kit works with the PS2, PS3 or Xbox 360 versions of the guitar and is currently up for auction on eBay with a starting bid of $75. At this point A4AJ hasn’t geared up production on the kit, so you’ll have to have the top bid if you want this one.