I may be too late for your conference, but hopefully this will help in the 
future.

First, you'll want to make a multi output device in the Audio Midi Setup app. 
Launch the app, find and activate the "Create New Device" menu button, choose 
"multi-output device" from the menu, and a new device will be placed in the 
devices table near the top of the window. Select that device, then find the 
unlabeled table further along. This table lists all the output devices on the 
computer; check the box next to all the ones you want to use and that should be 
it. You can now switch to that device (remember to set VoiceOver however you 
need to so you'll still have speech, or leave a display connected).

As to quickly switching, I imagine there's a utility for that, possibly on 
MacUpdate.com. If not, AppleScript may be able to do the job, though I've never 
looked into that possibility.
On Sep 29, 2014, at 3:37 AM, Jonathan Mosen <jmo...@mosen.org> wrote:

> Hi everyone. Wondering if anyone can help me with a query.
> I'm going to be streaming a conference shortly, and won't be using a hardware 
> mixer as I don't have one that's portable and don't have a need for a 
> portable option often enough to justify buying one.
> I'll  be providing commentary via my Blue Yeti microphone. I then want to 
> switch to the house audio, which will be coming in via a line in to my sound 
> card. The Yeti and the sound card are two separate input choices under System 
> Preferences.
> I have a couple of questions about this set-up in a mac context.
> First, I believe it is possible to combine separate inputs into one virtual 
> sound device? Since both the Yeti and the sound card have adjustable inputs, 
> I may be able to have them both going at once and manage them via their 
> respective input controls. Any advice on if this is possible, and if so, how, 
> is much appreciated.
> Second, if this isn't possible, do utilities exist that allow you to switch 
> inputs via function keys or some other method more easy than changing the 
> input in System Preferences? I would love to be able to switch from one input 
> to another at the touch of a button.
> Any help very much appreciated. Thanks a lot.
> Jonathan Mosen
> Mosen Consulting
> Blindness technology eBooks, tutorials and training
> http://Mosen.org
> 
> 
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Have a great day,
Alex Hall
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