I have a headset that works with my cell phone using a standard 2.5mm jack, and now i want to use it with my PSP on FTB2. I know that the PSP uses a 4-pin 3.5mm jack. Is there an adapter that has a 2.5mm female end and a 4-pin 3.5mm male end. I really don't want to spend $30(USD) on sony's PSP headset, but if i could spend less than $7(USD) on an adapter --i would.