Hello, i have a 2006 Pontiac G6 GTP with Monsoon. I decided to replace the factory stereo with a pioneer deh-x8600bh. I also bought a Metra 99-3303 and an antenna adapter (which turned out wasn't needed). The stereo harness already came with the Metra. I replaced the radio, it turned on, and the metra turns on fine, but i have no sound whatsoever, through none of the speakers. Yes i did disconnect one battery terminal before proceeding, that's not the problem. Was a radio reset needed? I thought monsoon's have an external amp, but i never saw one. Has anybody come across this?