Although work on the GS version of the Romantic Organ 25 stops complete with its GS console interface is not quite complete yet, the samples used in the Hauptwerk version are identical. So what you hear below is pretty much what the library will sound like running in GS3.
Neil Craig, a current user of the HW version has produced a superbly musical rendition of the Bridge Adagio in E Major which will give GS users a taster of what is to come. The reverberation was provided through a separate reverb plug-in but using the GS convoluted reverb settings would provide an even better result I reckon. It can be found at:-