I am using a Native Instruments Audio Kontrol 1 USB interface and I'm getting really bad popping and crackling in my speakers whenever a web page loads, I click the scroll bar and scroll through a website or click and scroll through my audio creation software (Propellerheads Record).
I upgraded to Windows 7 64 bit from XP Media Center and I have a Creative Labs Xfi XtremeMusic for my primary sound card. At first, the popping and crackling was occurring on that card, too, but I added some additional RAM and lowered the quality to 16-bit 41,000. That took care of the issues on that card but the issues on the Audio Kontrol 1 are still persistent.
I want to use my Audio Kontrol 1 for MP3's because I have my new Mackie MR5's plugged into it and they sound amazing (aside from the crackling and popping).
After digging through forum after forum, I think I've narrowed it down to a DPC issue. I downloaded the DPC Latency checker and ran it while I did every day tasks. I get spikes whenever a I load up a new webpage, or scroll through a site like Facebook or Reddit. Other sites don't cause as much of an issue. I have also scrolled through sites using the down arrow on my keyboard and my spikes stayed up in the red the entire time. I can't remember the numbers, but it was around half way, like in the image below. The popping and noise only occurs while I have music playing. If I don't, I don't have any issues.
This image below was recorded while I had the song I was working on playing, and I clicked and dragged around the devices area in Record. You can see the red lines start as soon as I start dragging around, then stop as soon as I let go. During this time the popping and crackling is awful.
I've tried disabling drivers for almost everything. I thought it was my old video card that had the worst performance score in the Windows area, so I replaced that, too. Nothing has worked so far. Is this just a major issue with how Windows is handling IRQ?