The problem is, I have two monitors set up right now, because the system came without the monitor cable. The original 1084 used the 6-pin barrel connector, which the 1084S doesn't seem to have.
Commodore wacky monitor cables. Might just be easiest to wire yourself a cable... I don't think DB23->DB9 cables are very common. (Though I do have one here!) I think the pinouts are available on-line, though. If not, shoot me a PM, and I can give you the pinout of mine, if you want to get that 1084S going.
So, I have two monitors: the 1084 provides color video, and the 1084S provides black-and-white video with stereo sound.
Monitors can interfere with stuff, especially other nearby monitors. Perhaps part of your annoying sound is caused by having the two monitors too close together? (More likely it's from a bad solder-joint or bad high-voltage, though. Both are common problems with the old 1084 of all series.)
Anyhow, might I suggest trying a cheap pair of powered stereo speakers sitting next to your 1084 mono, instead of a 1084S? ;-)
