Ok, you don't want to play your logic sounds THROUGH the triton, you want to play logic sounds through logic using the Triton as a controller. MIDI OUT of the Triton to MIDI In on the MIDI interface. Now play the keyboard and you should be able to see MIDI data in the MIDI meter on the transport bar. If you can't, you are either wired wrong, have a bad cable, or don't have the driver for the interface properly installed. If you can see the data, then select a track in the logic with a software instrument installed and you should be able to hear it when you play the Triton.