Ketron SD1000 ROM is 256MB
the SD2 ROM is 64MB
They used the extended ROM to add many new sounds in every category. So basically, you will get a SD2 with some new sounds.
Sadly for me, the compatibility with the SD2 is not 100%
They have removed some sounds, and remapped some guitar/bass noises.
My overall impression is that Ketron SD1000 is between the traditional hardware keyboard sound and VST sounds.
There is some very good sounds, never found in any keyboards.
There is also some imperfect things...
It is really a plug and play box with sounds
I will continue posting demos of every sounds of the SD1000