Interapp synths in Garageband just static? Other multitracks?

edited July 14 in Audio
Hey, folks... slowly figuring out all the awesome things I can do with my ICA4. Figured out my routings, but now I've run into another issue. When I try to record any interapp audio synth into Garageband while using the IAC4, all I hear is warbly static when I press the keys. It doesn't matter what synth or app I use, I get the same problem, even when I route it through AUM first. 

I've read a few others have resolved this problem using Audiobus, but I'm curious, is this unique to Garageband? Does anyone have any problems recording interapp audio with other multitracks?
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