Designed to be as unobtrusive as possible, the iRig PRE is an in-line preamp with an XLR connector on one end and a 20” hardwired 3.5mm cable for connecting to the headphone port on an iPhone, iPad or iPod touch on the other; they’re accompanied by a 3.5mm output port for connecting a set of monitoring headphones, or a mixer or PA system for live performances through an effects app such as VocaLive. A gain control is found on the right…