Hi Tyjapee -
I don't have Cubase installed here so I can't be too specific, but AFAICT here are a couple things to check out..
- In the Preferences, check the Scrub Volume, and maybe try turning off the "Use High Quality Scrub Mode" option (if it's on)..?
- Check the Control Room output, and if it's set to Monitor, try Master Out instead..?
Hopefully Matt or another Cubase maven will chime in with a suggestion/solution.. :-)