If you're not scared of loading a back up would you do me a favor and load up that #5 kernel, factory reset your rom, and see if you still have music pops? I had no issue with the music pops, and I bet if we can tell if it's an app or not we could track it down and maybe give adrynalyne somewhere to look for that problem. Just a thought. I would do it but I didn't get music pops.
I would do it, but I is scurred

in addition to what sheepy said you could try voodoo control from the market. it has the voodoo sound enhancements.
I'm not running voodoo yet. Maybe once I get more comfortable with this whole process. CWM and recovery mode are still very scary to me and I don't want to b0rk anything up in my current state of ignorance.