The X-station must be in synth mode. The 'PLAY /Synth' button above the LCD screen is used to toggle between template mode and synth mode. The synth mode will show "synth prog" in the LCD screen of the X-station. In synth mode, the output of the synth is effectively patched into X-Station inputs if the X-Station is in stereo mode or just into input 2 if the X-Station is in dual mono mode. This means that the monitor knob has to be turned fully anticlockwise to hear the synth only. By putting the monitor knob in the mid postion both input and output will be heard simultaneously.