Ok, here's what I want to do. I have a sennheiser pc 166 usb headset. I would like to run a splitter on the microphone side so that I can plug my iphone into the mic feed as well as my regular mic. What I want to do is be able to play sound effects from my mic occasionally through the iphone via that feed into ventrillo so others can hear. I'll never use the headset mic and iphone sound at the same time, could I use just a regular stereo y splitter to achieve this, anyone see any problems with this? Thanks!