I have a Casio CTK-2500 (non midi, non USB keyboard) connected to GarageBand through audio out and a Behringer UM2 interface.

I can record a track, but I have to listen in direct monitoring while playing or there is no sound on the headphones.

If I then go to piano lesson, I get the "There is no instrument attached to GarageBand" message.

I just updated to 10.3.1, everything else works fine, including my electric guitar.

Can I fix this or is it the nature of the keyboard I am using?

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