Emagic emi6/2m noise & core audio

Question

i have the emagic emi6/2m I/O and have a problem that maybe someone can shed some light on. when logic7 launches as soon as the "initializing core audio" message appears on the splash screen, a low volume noise like a constant test tone can be heard in both channels of the analog audio output. as soon as you quit logic the tone disappears. the tone is not there when playing audio from quicktime player (emi is my system audio out) or in final cut or soundtracks or waveburner. i have the most recent drivers for the emi6/2 (a62) and have the emi input on a separate firewire spigot. doesn't seem to be a ground problem or cabling as it only appears when logic is running. it's a constant noise and is unaffected by the mixer output levels. no pops or clicks as some on the forum experienced with this interface, just the constant low-level tone while logic is running. other than buy a new I/O, any suggestions?
dual G4   Mac OS X (10.3.9)  

Answer 1

No big deal.....A friend of mine has an emi2/6.
He experiences audio drop outs, now and then.
(Especially at low buffer settings)
Then I realized he has no power adapter connected, (He lost his).
It seems you don´t use that either.
Maybe, just maybe, the emi doesn´t get enough power from
the USB port. After all the emi is old and USB1, only.
JanD