Phantom Noise During MIDI Events

Hiya,
I've searched a bit, but haven't found much. I apologize if this has been covered. (Obligatory disclaimer complete!)
Starting earlier this week, I noticed a noise would accompany any MIDI notes I'd play on my keyboard through Logic. Frustrating. I'm having some difficulty describing the noise, but I'll try. First, it has a distinct tone, which is the same tone as the note being keyed. Beyond that it's faint, full of static and has a bit of a phasing effect.
My troubleshooting so far: (restarting, shutting off and on, unplugging and plugging included!)
1) Removed my usb keyboard from the computer, and played MIDI notes through the caps lock keyboard. Issue persists.
2) Used the pencil tool to create MIDI events. Issue persists on playback.
3) Deleted the Logic plist. Issue persists.
4) Tested similarly in GarageBand. Issue persists.
It should be mentioned that I'm not having any other audio issues.
I'm currently reinstalling Logic, but I can't imagine that's going to change much considering the issue is cross application. (I will test older projects sequenced in the Before Time to see if those events phase as well as soon as Logic is done reinstalling.) I'm sure it's a simple solution that I am not familiar with. No doubt I'll kick myself when someone figures it out!
Thanks in advance!

tbirdparis wrote:
It sounds like you might just be hearing electronic interference noise due to the fact that you're using the internal sound of the Mac. In the old days (up to around the time of the G5s), the built in sound on Macs was fairly decent quality, at least in terms of the way it was isolated to reject interference from the electronics running inside the box. More recent models don't seem to be quite as good in this regard,
This is what I thought when first reading this post last night. I have an old Fender guitar amp from the 50's that has the same sound. The same note, played low in the background with a quieter layer of distortion. (static).
It will show up most on tones that are closer to a pure sine wave, like some of the Rhodes/El.Piano sounds. You might not notice it on more complex tones. Also will show up more playing quietly.
What do you have set as the Mac's input device, is it set to Line input, if so try unplugging anything going into the input, just to see if there's some interference.
Also, what are you monitoring the sound through?
pancenter-

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