@Frank > Did you put the controller into general MIDI mode?
Disconnect the USB cable from the SZ and turn it off.
Hold Shift + Play/Pause from the left deck while powering-on the SZ.
This will put the controller into UTILITY SETTINGS mode.
If the KEY LOCK button on the left deck is illuminated, you are in forced-MIDI mode. Press the KEY LOCK button to disable it and put the SZ into auto-detect mode.