Hello Burkuagh,
you can simply copy the galbanum wav files to the Nemesis_waves directory. Make sure that you use the 24 bit or 16 bit files. Then you can browse them like the factory waveforms with < and >.
The waveforms are stored within your patches (.fxp) and songs. Once you loaded a waveform you don't have to care if the files is still in the right place on your harddisc later.