The meter goes from a -48 to 0 dB, and I hoped to get readings of loud things, like engines. The Prefs won't go above zero. Is it showing SPL somewhere, or do I need to buy ProPhase? Also, the Support link goes to a forum, which would be fine . . . if there were a way to create a new login.

I use this with an external audio interface to monitor the levels going into my streaming encoder. It's great, and the RMS + Peak meters are a lifesaver, as is the clipping indicator. Love that it shows how many frames in a row were clipped.If you're using it with something like a UAD Apollo, you can monitor the system output by sending the Mac's output to a virtual interface on the Apollo, and then chosing those inputs (UAD 9/10 are the first set of virtual interfaces). You can also create other meters that are showing what's coming from other interface inputs.If you're trying to monitor the levels of the system audio out, you'll need to use something like Soundflower (Open Source) or Loopback ($99 from RogueAmoeba, so not the cheapest solution).

In finally got this to work the way I needed it to. Unforunatly (for some reason) they didn’t design it to have the one audio source I needed (internal speakers). So I had to jump thru some hoops by installing the Soundflowerbed (free) app. But then got stuck as when you launch this little app it doesn’t appear as a normal app. Instead you have to realize that it added a tiny little icon up in the upper right corner of the Mac screen were all the other little icons are. From there you can set the audio path that you need. In my case I wanted it for watching levels with iMovie.

THis does not show you what is being OUTPUT and doesn’t even allow access to the built-in signal. I’m not sure what it’s supposed to do. It just shows the inout level of the attached camera, but NOTHING related to what the Mac itself is sending out, let alone what a specific app is sening out.Save your money for a cup of coffee. This is worthless and NOT AT ALL for professional use. I suspect the other reviews are shills. If Apple allowed, I’d have a few choice words for these guys, but the most polite i can come up with is THEIVES!