Problem setting sampling rate message when trying to use aggregate device

On my mac, when I attempt to set up an aggregate device to use more than one USB mic connected through at powered hub, I get the message “problem setting sampling rate” on each mic…and n-track does not properly recognize the mics. This works fine in Garageband, with the same computer, same hub, same mics. Any suggestions?

I found the turtorial on this…I should be able to work it out now. :slight_smile: