I think you will find that the Korg DNC is for right hand sounds only. (Just like Yamaha SA)
RX Technology is just a marketing name for the Korg sound engine

Apart from the very latest styles from Korg that use Guitar mode, both they and Roland styles convert quite well to other keyboards, unlike Yamaha Mega Voices. (Which are a pain in the backside, and so repetitive)

IMO both Korg and Roland styles leave Yamaha styles for dead, due to the fact that Yamaha styles are very song specific, and include everything including the kitchen sink. (My pet hate with styles, as I come from an organ background)

BTW all studios for a good number of years now use a minimum of 24 bit 96 KHz for their recordings, (Rather than the old and antiquated 16 bit 44 KHz (CD Quality) of previous years) so make sure your sound system can get the best from this level, otherwise you will be missing out on a lot. (You will find that most modern technology’s (Blu-Ray etc.) now use 24 bit sound as the norm)

Bill