It's definitely easy when you know what you are doing! ;D Who can argue :-) All I need is to connect my controller (which is USB, though it doesn't matter) to my computer to play live B-4 stand-alone version, because by it's characteristics my laptop is on the lower edge of "acceptable", so I'd rather wont be using any hosts on it. And I also want to be able to transpose B-4. I installed the programm, that you recoomended, but still unable to solve this puzzle. So, basically it boils down to the task of connecting outputs of two devices (one would be that little program and the other one would be my keyboard) to the same input of B-4 simultaneosly. Thanks for trying to help me. Really appreciate it.