Zoom G5 not recording with Cubase

[7sen]

Hi, I have a Zoom G5 pedal, and Cubase 7 came free with it. I connected the G5 to my PC and it's not recording. I installed the driver from the zoom website and it's detected by the software but when i try to record i just get a flat line. I can record on Audacity but the sound quality is bad. Some help would be really great, thanks in advance.