Hi Kroes, No problem. I suspect the problem was connected to the track. Let me explain... A Channel strip can have multiple tracks attached to it. When this is the case for audio tracks, if there are regions on both tracks (or lanes of the channel strip) the contents of only one track can be played back. Make sure you create a new track with a new channel strip... But whatever the reason, I'm glad you got the USB mic working. It makes sense that in Logic 9 there is no need to create an aggregate device for this type of device. Cheers Rounik

Thanks for the help!