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<p>Some computers support multi-channel output for surround sound. This usually
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uses multiple TRS jacks, which are often color-coded. If you are unsure which
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plugs go in which sockets, you can test the sound output in the sound settings.
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<gui>Sound</gui>. On the <gui>Hardware</gui> tab, select your speakers in the list
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of devices, then click <gui>Test Speakers</gui>. In the pop-up window, click the
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button for each speaker. Each button will speak its position only to the channel