IK Multimedia’s new iRig PowerBridge ($70) is a new accessory that solves an issue we’ve had with IK’s Lightning-connected studio accessories for a while — the problem of powering your iPad, iPhone, or iPod touch while using them. Devices such as the iRig PADS, iRig KEYS, and iRig Mic HD connect to the Lightning port, so you can’t normally connect your iOS device to power at the same time. While this is fine for casual use,…