The only way to avoid it with iTunes and XP is to transmit it wirelessly to an Airport Express. Since the brick has only a USB input and the AE only an optical output you would have to convert it.
You will be amazed how much better your current set up will sound without Kmixer. You absolutely have to avoid using it.
You will be amazed how much better your current set up will sound without Kmixer. You absolutely have to avoid using it.