You might have read about the problem I had concerning AUX-IN a while ago. The cause for this problem wasn't entirely related to the chip (CS 4231A). So other things might have had some influence. I'm not telling you that you must have your unit repaired, but I just recommend having it repaired if it's still in warranty, which is one year from the date of purchase. Basically: if I was you, I would have it repaired!

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Edwin de Vaan