This issue can be fixed by taking a few precautions. Once I put the wall circuit computer and monitor and the amp on the UPS too the noise went away. This creates a ground loop and results in the high freq. My midi ports were also powered by the UPS. Easily connect mics, instrutments, outboard effects, monitors, and other analog, digital, and/or MIDI gear with your computer to capture and create studio-quality productions. I had the problem initially on this box because my computer which powered the box was connected directly to the wall circuit while my audio was going through an amp w hich was powered by a UPS. Record, edit, and mix performances-with the highest audio resolutions-using the professional-grade Mbox Pro desktop audio interface. The real issue with the mbox is a ground loop issue. If you ground the audio circuit you will decrease your audio performance. There is a reason why audio circuits are isolated from ground - it improves the signal to noise ratio.
I saw a video on UTube advocating soldering a ground wire to the circuit board. It comes out the audio out ports and is a definite no-no on your audio tracks. There is an issue I have seen a lot on the internet which I also discovered - a high frequency noise when the box is activated. This is a great way to get into Pro Tools without spending a lot of $$.
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