Dirk,
I am listening right now to your songs; my favorites are easily "Laura", "Raindrops" and especially "Blues". "One note samba", on the other hand, is interesting as an idea (the use of the vocoder), but sounds less good, maybe because the style does not sound as authentic as the ones you used in "Blues" or "Raindrops".
Speaking of "Raindrops", I loved your arrangement a la George Shearing; the style is also very good (our friend Scott Yee should really consider this keyboard, given his love for jazz styles ).
Speaking now of the two Gerswhin tunes, my favorite is the orchestral one, because I really don't like the acoustic piano sound of the PA1 X pro; by the way, the final part, that starts at 41 sec, is much better than the first one.
All in all, I would say that you are having a lot of fun in your home studio!
Keep up the good work! "Blues" is really awesome!
Andrea