Christine
In your one question, you’re covering lots of ground. My suggestion is take it slow - start with the basics.
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Is your N12 set-up correctly with Cubase?
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Check DEVICES → VST AUDIO SYSTEM → ASIO DRIVER. Select the correct driver.
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The Integra-7 is a midi capable hardware instrument - access is achieved via midi. If Roland have created a VST wrapper - this wrapper, which appears as a software instrument is in fact communicating to the I-7 hardware.