[ubuntu] Presario CQ56 Audio-In to Speakers Issue

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http://ubuntuforums.org – Hi there. Using ubuntu 11.04 64 bit. Trying to pipe the audio for my xbox360 into and through my laptop with a female-rca to male-3.5mm analog y-adapter to a pair of external speakers. Problem is, while everything points toward my sound card picking up the audio (pavumeter responds to the manipulation of the menu with sound spikes, the mixer register's mic audio) but no matter what I try and fiddle with, inculding alsamixer, the audio won't play through the speakers - external or internal. Happy to provide any pertinent information, can anyone help? (Hardware)