Hello I'm looking to buy a POD X3, but theres just one problem, I don't know where to connect it to. First of all I can't do it through my computer and headphones are fine, but I can't listen just through headphones. I do have a cheap 15 watt amplifier and I've heard you can set the POD to combo front, but I don't think this will give a good sound. I also have a speaker system with a usb port and a port in, can I connect it to that?