With a name like CableJive, you might think the Massachusetts-based company would run out of new products to create. Yet it continues to mine new niches, now including the ProJive XLR ($35). Compatible with iPads, iPhones, and iPod touches running audio recording apps -- as well as a number of other devices -- it lets users connect XLR mics and mixers through the audio-in capabilities of the headphone port, promising a properly balanced audio signal…