See: VRC World

VRC have introduced the new 9T 12-bit high-performance USB adaptor giving an even smoother and responsive virtual RC ride than before. With this new technology USB adaptor you achieve a higher frame rate, meaning every transmitter input is translated to car control even quicker and smoother. The 9T has 4 channels, so if your radio/receiver has more than 2 channels you can now map functions like ‘turn marshal’ and ‘refuel’ to a function on your radio so you don’t need to use the keyboard, gaining valuable seconds.