HELP! Recordin q about zoom H6 + Cubase 7LE


I connected my zoom succesfully to my windows 8.1 PC and then to cubase. Im able to record through Zoom.

My question is it possible to make recording by using cubase instrument ie. Piano and make music with that and then add to that recording with zoom?

Another problem I have is that after 5 minutes of connecting zoom to computer and opening cubase zoom start to make RRRRRRR sound and only way to stop it seems to be to close the zoom. What could this be?

any ideas?