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ATI MMC uses your sound card for audio work. It is tag-teamed and controlled by ATI MMC. ATI MMC generally mutes and unmutes your audio card inputs for whatever you select as the audio input under the Initialization Wizard in ATI MMC.
Any computer will play whatever audio is fed into it, all the time. To turn it off, unplug it, or mute that input when you don't want to hear it.
For some reason, you're not getting the input muted.
This could be it, or maybe it's not it. I don't know what "digital box" connections are being used in and out of the computer. I'd have to have a detailed map of what wires goes where, and what audio settings are in Windows, as well as ATI MMC.
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