i having the same problem with recording and playing back on my cubase AI 4. I have connected my pc to the yamaha MWc12 through a usb,the cubase AI 4 software came with the mixer. my mic is plugged to the mixer and works perfect. but the software dosent wana record nor play back.i need assistance with this please..this is my freaking third post and you guys are definately not helping.i feel i wasted my money and i would not mind taking legal actions if i dont solve this problem.Thanks