We've been using the VSL1818 for live applications in a small singing group. Hooking up the laptop, then an airport express to use IPad as a quick mixer adjuster. Now the laptop seems to be headed south and the newer laptops are sans ethernet connection that I would usually hook to the airport express. Simple question. If I just wire up a touch screen laptop via usb to the VSL1818, will it function similarly to the Ipad?