But most of the feel of their piano (in the video you ref) is the after effect right?
For example, the chorus, reverb etc … on my Yamaha GS, patch 8 is called DX Piano and sounds a bit like the EP on the video (subjective of course).
If I then use the reverb/hall effects/chorus etc (part of the GS extension) I can make is sound like the later sounds in the video.
I can also throw it thru Cubase effects (MDA also do a series of chorus etc).
Or I pass it thru my Zoom R16 and let it add effect … or my Miniak and let it add effects (or all of the above).
The MDA is tweakable too … so pass that thru effects and you have a reasonable approximation.
Hexter, on linux, is a DX7. Sysex in the patch and it should sound like the piano used (assuming they use the DX7 patch).
You can probably find some soundfonts too that are accurate samples of a DX7 EP. And Cakewalk have given away their soundfont player for free.
Again, throw post-processing at it to change the sound.
Oh an in another forum, someone was asking about Abelton … I downloaded a lite version to try to help setup synth and that had some excellent samples on it. I believe you can get this for free if you buy some relatively cheap kit. IE if you used their trial version and like it … you could get the lite version when buying an effects box