This following post is an updated version of my original: Podcasting with two USB Mic's in Garageband PICS
So after searching the internet and apple forums I found some work arounds, but finally found a way that works great and is easy to setup using the utilities provided by my Mac.
So here is how I found out how to do it:
Step 1. Plug both of your USB mics into your Mac
Step 2. Open up the "Audio MIDI Setup" utility Applications -> Utilities -> Audio MIDI Setup
Step 3. In the bottom left of the "Audio MIDI Setup" window click on the "+" button to add a new aggregate device.
Step 4. Locate your two USB mics and check in the "use" column. You can now double click on the new device "Aggregate Device" and change the name. I changed mine to "Dual Blue Snowball Mics" so that I could easily identify it later on.
Step 5. Verify that your newly created aggregate device shows up in your audio settings. You can find it under System Preferences -> Sound -> Inputs
Step 6. Open your Garageband podcast project. You now want to set your Garageband Preferences to take the input from your new aggregate device. Garageband -> Preferences -> Audio/MIDI -> Audio Input and find your device for mine I added Dual Blue Snowball.
Step 7. Now to add the input to the podcast poject. For this I added two new tracks using the Podcasting -> No effects setting (you can set this by using the track info on the right hand side after clicking on the track).
NOTE: Don't forget to change the "input" on the track info to "Channel 1 & 2 (stereo)" for one of the tracks and "Channel 3 & 4 (stereo)" for the second track. Otherwise Garageband won't pick up both mic inputs.
You should now be able to test either mic and verify that they are input and being recorded by Gargageband.
Good luck and happy podcasting.
The dude abides.
- Make sure you are connecting your USB mics directly into the laptop or desktop computer. If you use a USB hub you may have some interference or it may not pickup the mic correctly.