Sorry guys I did not get round to answering sooner, and thanks for your input so far.

Machetero and 124,

It will be hard to trust to paper all that I am doing to enhance my arranger keyboard and loads of it are "trial and error".
What has always puzzled and slightly irritated me is a lot of musicians' obsession with numbers and quantities. I mean does it really matter whether you have an archive of 2000 styles, or 4000 sounds ?
Reminds me of someone boasting more than 100 gigabyte of mp3 popsongs on his harddisk. Great but when will he ever listen to only a minor fraction ?
What do I tweak ?
Well obviously in the styles I tweak all the volumes, the effect settings for each accompaniment, muting, DRUM settings/selection and part muting (very important). Theoretically you can tweak each style probably millions of different ways so like I said there is a lot of trial and error.
Two major pieces of advice, and I guess that goes for virtually any arranger keyboard.
Try and replace all the acc. tracks with the exception of drums and bass by the best acoustic piano sound on board. Then remove ALL of the reverb ( and if necessary) the choruses etc. from all the accomp. sections.
From there you listen to what you get and start filling it up again according to taste, trial and guesswork.
Another very basic advice that I would like to give anyone is "what about your basic samples and sounds ?
I mean let's be honest, how many sounds do you really need for your righthand playing ?
Depending on your taste inevitably a couple of good pianos, elect. pianos, organs, saxes,
brass, guitars, etc. I would venture to say that you do not get beyond 20 or 30 preferred right hand sounds.
So what I try and do is select for example the best (to my ears)acoustic piano, and by going to the basic sound programming, see whether I can improve on that one or have it more geared to my personal taste. I would do the same with my basic needs for righthand playing, in particular guitar, sax, elec.piano and brass. Again there is massive trial and error here as well.
But once you have done that you benefit tremendously from all your efforts. Of course
you can also incorporate your own sound improvements in your accompaniments an total registrations. I cannot stress how important I consider making good registrations.
And much as I agree with what most of you have been saying here like Donny remarking that the only thing that matters is the final product, "the tools we use are secondary ", yes but do make the most of the tools you have at your disposal, that's my point.
I also agree with DIKI that the better the musician the less need he may have for tweaking.That would explain my modest ability of playing,and , if I may believe friends of mine,my much greater ability in good tweaking......
But DIKI hits the nail right on the head by stating that it has often more to do with the ease that you can transform the keyboard into something new and fresh, and that it is often strange that in this very field many people cannot be bothered to mess with a lot.
Indeed VARIETY is what we need, the point is how do we achieve it, by ordering or downloading yet another cart-load of styles and sounds, or by creatively exploring and tweaking the hundreds of sounds and styles at our disposal in our own keyboard(s) ??

Have a nice weekend,
John Smies
Holland