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I would like to know the output of which commands should be posted when asking a question based on sound errors (no sound / crackling sound etc.)

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This, being a canonical question will receive a bounty shortly –  Minato Namikaze May 27 '12 at 5:22
@AmithKK are you sure it is a canonical Q? –  Ashu May 27 '12 at 8:55
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