If Local control is turned off in the synth global menu you will not be able to play the synth or change synth patches using the controls on the X Station.

To turn this back on press the 'global' button twice when in synth mode to enter the synth global menu. You can then use the 'Bank/Page' buttons to select the 'Syn Local Cntrl:' setting and use the 'DATA/VALUE' knob to set this to 'On' then press'write' to save the global settings.

For more information about Local Control click here.