turtle beach's are sorround sound headphones, usually sporting dolby 5.1.
What imold is looking for is basically the Acid Rock controller where you can plug a mp3 player right into the mic. It is really just as easy as that, put a jack on your mic input and plug your mp3 in.
the down fall is that you cant talk and play tunes at the same time without some sort of audio mixing. I havnt seen anyone use a mixing circuit, but there are plenty of examples how to do it on the net. A lot of mixing circuits attenuate the audio signals form both sources so an amplifier is probably needed to boost the mixed signals once they have been mixed.