M-Audio USB Audio Interface With 2x Combo Inputs With Crystal Preamps & Phantom Power The M-Track Duo is the best, most portable recording interface in its classIt delivers 16-bit/48kHz audio resolution in a compact and easy to use format that is ideal for creating music on any Mac, PC or iOS device. This versatile interface works great for recording any type of sound source and features two Combo Crystal Preamps with phantom power, making it compatible with any guitar or microphone. Plus, there is a dedicated switch to choose line level input for connecting digital pianos, drum machines or any other stereo 14-inch line level device. M-Track Duo is completely powered by USB, which makes it portable and perfect for anyone on-the-go. Throw it into your bag, grab a laptop, and create your next podcast, song, or mix, anywhere you want!