Audio via USB

Hi, my friend who is about to replace Logic with Cubase says it is not possible to run f.ex a TR-8 drummachine and send all audio via usb, to generate separate channels for each drum. Is it so that Cubase can only run one sound card at the time, and not transmit audio via USB? I just feel stupid, this is new to me. He says it is a big drawback using Cubase? hm, please help, many thanks…