I don't have an H4, but I'm looking at the Samson/Zoom site.
Mac OS X 10.2 or higher?
Upgraded firmware on the H4 to 2.1 or higher?
Plugged in with the power on the H4 off (this saves a few steps)?
Selected Audio I/O on the Zoom?
Set the sample rate on the Zoom?
Clicked Connect on the Zoom?
All these from page 80-81 of the manual.
I don't have a Mac so I don't have any idea what the interface looks like on that end, but have you seen evidence of the H4 in your audio selections? The H4 may have replaced your built-in audio device as the default, or you may have to make this selection in one or more places.
And, not to be a pedant (OK, OK, I'm totally pedantic <grin>) meters don't attenuate. To attenuate is to make smaller.
Fran
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