They're just breaks between midi clips.

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thanks for the reply, im not to sure the lines i was on about look like some sort of automation going up and down on the pink and orange midi tracks at 3.15 in the clip, cant seem to get that with cubase myself

That's modulation data. If you record modwheel changes during a performance you'll see that, or alternatively if you draw in pitchbend. controller or any other kind of data at the bottom of an open midi clip you'll see that too.

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ah i see now i seen this around many times but never new what it was thank you