PB3 was a curio I got in a bundle and never used.
PB4 is a whole new level. Particularly the selection of up to 3x genres has made this a phenomenally exciting tool.
I believe it’s currently possibly to route PB4 sequencer to XLN XO, so that we can enjoy the benefits of the PB4 intelligent sequencing, together with using our own entire sample libraries for the sounds, via XO.
… But what would be truly incredible and destroy all competition would be if PB4 could scan our personal sample library (or selected folders therein) and use those sounds directly in PB4.