I've had this problem before and fixed it by rebooting, but now I can't get it to stop. I'm on Mac, using Logic. Playing Komplete Kontrol S49, in a MIDI track, even with no midi instrument loaded, I get a piano. If I load an instrument into the track, the instrument plays along with the Piano sound. I opened up the Kontrol app, I only have selected the Port 1 input and output. How do I resolve this?