I am looking for a 3.5mm 4-pole to 2x 4-pole Y-Adapter. As an example, something that can enable two 3.5mm smartphone headsets which have stereo sound and mic (4-pole on both headsets) to be plugged into one smartphone via the 3.5mm jack. I have found plenty of splitters and adapter that take a 4-pole and split it into audio and mic, but I am looking for an adapter that "Y-Splits" a 4-pole jack into 2x 4-pole jacks.