Korakios's post in How to use XW-G1 Sliders & Knobs as Software Controllers in DAW Virtual Instruments??? was marked as the answer
THERE IS A WORKAROUND SO THE SLIDERS CAN SEND MIDI CC (and use the G1 sliders for controlling a virtual synth in your PC)
First turn local off. Then make sure that all parts send midi to the output . (PERFORMANCE->EDIT->MIDI->Midi_Out).
Assign the Rotary Knobs (not the sliders) a MidiCC ,to control whatever you like and SAVE the patch.
Now goto MIXER and select volume (or pan ,tune etc). Magic vodoo ,the sliders transmit MidiCC (with visual feedback on the Screen!).
Use a midi CC mapper (I personally use Bome's MidiTranslator) and assign / re-map the CC messages to whatever you like.
Happy jamming