No variable audio out means that whatever the volume is at on the TV it will output that level from the TV. So if you have your surround sound on and if you change the volume on your TV it will also make your surround sound louder with out having to turn up that volume on your surround sound, but if you have your volume muted then so will the audio out. So if it is a fixed audio out then no matter what level you have the TV set to it will output the same level. If you just want audio to go to your surround sound then just hook the video cables up to your TV and the audio to your surround sound. I would guess that you are using Red and White cables... If you are that only gives you left and right audio. Not surround sound, so you would want to run optical, HDMI, digital coax, or the analog 6 channel audio cables.
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What is the exact model? Not all TV has a choice to select the audio line out to be fixed or variabled, or speakers off function on the on screen audio set up menu.
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