It's no amplifier substitute, but Line 6 has come up with something potentially even better for the budding songwriter buried deep within your rhythmic veins. The MIDI Mobilizer for iPhone and iPod touch is an app-based peripheral that lets you record, playback, store, and transfer MIDI sequences and parameters using the MIDI Memo Recorder software. While it does sound convenient in theory, we'll have to wait until we can try the dongle out for ourselves. At this point in time, price of the Mobilizer is TBD and the release date is the ever-vague Spring 2010. As for the recorder app, it's currently available on iTunes free of charge, although it's more or less useless without the complementary hardware. For now, you'll just have to settle with living vicariously through the promo video, after the break.