I haven't had any trouble getting the first channel to work with a guitar input. Haven't plugged anything into #2 yet or mics into either. One weird thing I've noticed is that if I have a guitar plugged into #1, I can't connect my iPhone or iPad to the Spire via it's wi-fi - it just won't join. Unplug it, it connects fine, and then I can plug back in. I'm not sure I'll ever have occasion to use the second input, but I may at some point...
-Ray
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