When using the PX-5S as a midi controller and playing Addictive Keys on my Windows 8 laptop, I'm getting a phasing effect-- like two copies of the piano sound are playing at the same time. I've gone into System Settings/MIDI and changed local on to "off", high resolution out to "off", and other midi settings that should not matter. I'm using a midi out cable to my Nativie Instruments Komplete Audio 6 interface. There is no midi "in" cable going into the PX-5S and I don't have usb connected at all. I use Sampletank 3 vsti using the same setup and don't have this problem. I have even re-installed Addictive Keys and that didn't fix it. Also, if I play the virtual keyboard in the software with my mouse clicks, the notes sound properly, but playing the same notes with the PX-5S brings back the phasy sound. Thanks for any solution to this.