I have the same problem, but with the CI2… I used the DPC latency checker which showed that I had some driver issues causing some pops and clicks. I eventually found out that my Atheros wireless LAN adapter was the issue, I manually updated the driver to something much newer (the old driver was over 3 yrs old). It got a bit better but I’m still having some pops and clicks though and this is actually a common issue because this has happened to me before with a competetor’s portable usb mixer and on another computer… this must just be a windows issue. But how do we solve it?? Please help.