Some more info regarding the problems with IC5:
Tried it as well with the MN3007 removed, and the CD4047 still produces the static noise. I'm fairly sure the CD4047 is causing the problems, as the signal arrives normally at Pin 3 of the MN3007, as well as pin 2 of the Bias trimmer, however, it leaves the MN3007 as the static.
Pins 1, 2, and 3 of IC5 also produce the static, along with pin 11. For some reason, when the CD4047 is installed, all of the pins have continuity to ground, something which stops when it isn't in there. Reflowed all the joints for the IC and around it, no change. Voltages are what they're supposed to be at.