Loopback problem

I am using single guitar amp with loopback and an Apogee Gio. The inputs and outputs are all working fine, but loopback isn't. When I try to record, loopback isn't recording, though the playhead is moving. What am I doing wrong?

This may seem like a dumb question, but well, I've certainly fallen prey to the 10cm rule often enough... Do you actually have audio routed to Loopback? When I use it, I assign the desired channel strip(s) to an output buss, then assign Loopback's input to that same buss. This is just one way of doing it of course.

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