Using Spark Amp as an Input

I connected my Positive Grid Spark amp to my iPhone via an OTG cable (using the USB output of the Spark amp).

When I record a loop in Loopy, it is picking it up from the microphone, not from the signal over the USB cable. I can tell, because when I talk, Loopy picks it up.

How do I tell Loopy to use the USB output of the Spark amp as its input, rather than the microphone on the phone?


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