NuForce has rolled out its new Icon iDo digital audio converter (DAC) and headphone amplifier for the iPad, iPhone, and iPod touch. The iDo is designed to greatly improve the quality of audio being delivered from the device—especially in the case of Apple Lossless files—by bypassing the device’s built-in DAC and extracting the audio data in its original digital form. It requires a 30-pin connection to the device, as well as a power…