First, go to devices and VST Connections. Select the Input section and make sure that the bus for your keyboard is assigned to the correct inputs in the Device Port Column.
Now go to the audio track and make sure that the right input bus is selected in the inspector column. Be sure to select the Record Enable button and Monitor button on the track.
You should get an audio signal at that point.
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Brad Hoyt
Applications Specialist
Steinberg North America
Yamaha Music Marketing Group