Hi FransN:
WOW! I'm really excited to hear you're taking delivery of your PA3X in the next day or so, especially realizing how long (5+ mos) you've been patiently waiting. I also realize this will be a HUGE leap (from the PA500) for you. I remember the similar feeling I had leading up to me getting my Tyros 4, including the anticipatory excitement I had the night before getting little sleep. That said, get as much sleep as you can 'now' because once you take delivery, I can bet you will get even less sleep as I'm sure you'll be playing it into the wee hours of the morning everyday.
In addition to getting your first hand PA3X feedback on its new sounds,styles and navigational operation, I'm especially excited to hear more about the new chord sequencer as well vocal harmonizer. It would also be cool if you could post a video/audio of you playing it as well. FransN: Congratulations in advance. - Scott