I found a way how can I play Ketron SD2 sounds without this module.
http://articulo.mercadolibre.cl/MLC-419447125-sonidos-del-modulo-ketron-sd2-en-formato-sf2-_JM
I know 4 or 5 persons who sampled the Ketron SD2.
Every version is a different size, and a different quality.
Let us know if you buy this one.