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Combine multiple audio inputs for use in GarageBand Apps
I was looking for a way to have multiple audio inputs into GarageBand, say using my Digital Line in, two iMics, and anything else that will get audio, but GarageBand only lets you choose one input at a time. But with a tip from the guys at Rogue Amoeba, there is a way!

Using the Audio MIDI Setup application (in Utilities), choose "Open Aggregate Device Editor" in the Audio menu. Here you can create a virtual device that combines all your other inputs. Click the + sign to create a new device, then check "Use" off on the devices in the list that you want in your virtual device. If you like, double-click "Aggregate Device" to change the name to something of your choosing.

In GarageBand, choose your new device from the input list and there you go! Theoretically, you can buy four iMics and an USB hub and you can have eight inputs -- but I don't know the maximum number of audio streams that can be used simultaneously over one USB channel. But, this is a lot cheaper than buying an eight-input device which can run up to $800. Enjoy!
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Combine multiple audio inputs for use in GarageBand
Authored by: marroug on Jun 28, '05 12:13:55PM
Just a note, this is a 10.4 only hint. Core Audio is slowly becoming what was advertised back in 10.1...

Travis Gregg

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Combine multiple audio inputs for use in GarageBand
Authored by: Shawn Parr on Jun 28, '05 05:40:43PM

This will not work with Digidesign interfaces (i.e. 002, Mbox, etc).

Digi has hobbled their Core Audio plug-in so that it will not appear in the aggregation window.

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Audio Streams
Authored by: Shawn Parr on Jun 28, '05 05:45:49PM

To answer the question about USB and audio streams:

USB 1.1 (Or USB2.0 Full-Speed) should allow up to 6 channels of 48khz 24 bit audio, although that is using up the bus and if used often you may get drop-outs.

USB 2.0 High-Speed can get a lot more depending on the sampling rate and bit depth, but 16+ channels are possible. The same is true with Firewire 400, and of course more with Firewire 800.

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Troubleshooting: must create device as admin user
Authored by: huzzam on Feb 27, '06 01:57:16PM

I couldn't get this to work for a few days. I'd open the editor, make the new device, and it wouldn't show up in any applications. If I quit Audio MIDI Setup & reopened it, the new device was no longer there.

The problem was that I was doing this as a regular user, not an admin. I just finally got it to work by logging in as an admin user, making the device, and logging back in as my regular user. Now the regular user has the aggregate device available.


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Troubleshooting: must create device as admin user
Authored by: jerimiah797 on Apr 03, '06 03:47:14PM

Do you think that other operations in the Audio Midi Setup CP also require you to be logged in as an Admin? I'm trying to enable the rear outputs to send the audio through while the interface is recording. There are check boxes in the firepod's I/O list, but they are greyed out for me. Haven't tried it as an admin yet, though.

Too bad I could find NADA about this on the Apple or Presonus support site...

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