Logic Pro Input Gain Field and Knob

[Antaren]

I had my audio interface off accidentally, and was using the output and input device set to "using built in output and Built in Microphone." It was then I noticed the active Input Gain Field and Knob on the top of the channel strip. It seems like this knob only works when using built in output and built in microphone. Why would this be the case? It seems like useful feature. Here's a screen shot. Thanks.

 

[facej]

The audio device controls depend on the interface. Built-in, of course. My Zoom H6n has it. Apogee has them. I wish my XR18 had them.

You can read all the gory details, and see images of controls, here

Technical Note TN2332: Logic Pro X - Core Audio Device Properties Supported by Logic Pro X 10.1

 

[Antaren]

Thanks facej. I wonder if the gain plug-in does the same thing.

 

[facej]

The Gain plugin can certainly be used to increase the level of an incoming signal, but the audio device control changes things on the interface...on my Zoom if I only use Gain in Logic any recordings made on the Zoom won't have proper levels.

I have been known to pull a bass track recorded at peaks of -80 dB, used 4 Gain plugins to get it bumped up to usable ;-)

The one controls hardware gain, the other "after the fact" in the box levels.

 

[Antaren]

Thanks again facej. My audio interface doesn't have input gain field and knob. But it does other things well.