求翻译：If you have multiple sound cards, you need to tell the SRS Audio Sandbox which sound card it should send processed audio to. The target sound card will be the one your headphones and speakers are connected to. Typical systems only have one sound card and by default the SRS device will associate itself with the one sound card. If the preferred sound card becomes unavailable, the SRS Audio Sandbox will default to the next compatible device it finds.是什么意思？

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