Have connected to the PC a Kawai CN34 MIDI In and Out. Both directions work after I have realized that you can not on the cable marked MIDI In on Piano In and Out cable plugged on piano out but that you have to replace it. Both paths then fold with MIDI programs, so take both that Piano drive.
Have an additional 5 m USB cable to taken with repeater, it works perfectly. Without ASIO4ALL Driver there are noticeable latency, the driver is then off (noticeable latency is not anyway on cable ... there would have to be some 100 kilometers).