Yes, the Touch Pro multi adapter's a little box with a short cable attached. It's not at all small, but offers connections for 3.5mm and 2.5mm headsets, as well as a charging and htc port.
I've used the following adapter, and it sounds great to me:
http://www.amazon.com/YS-AUC-2-1-Mul...5150615&sr=8-5
But I haven't used it in a long time, because it doesn't fit with the ebay skin case I have. It's very small, and as convenient as you're going to find, because the mini usb port is useful. I got mine from EBAY, and I think I spent between 3 and 4 bucks.