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You could investigate the sounds in the libraries and see how they react to layer level alteration. As with just about all synths, the later sounds developed always beat the original presets hands down.
As an aside, the DX sounds I have on my DX5, which are all third party sounds, beat the hell out of those 'classic but oh so 80s' original DX presets.
In the case of the 1000s, the original PX sounds were great, but there were some turkeys. The bowed ac. bass was a triumph of looping the plucked bass sound, but the result sounded more like a bee on valium! Likewise the original electric piano was rather naff by later standards. The one in the PX Plus and Pro 1 as used by Lyle Mays amongst others, is still fantastic. Essentially, there's a lot of wonderful sounds in the Objectmover banks to investigate.
Hope this helps!