For me, it's a little extra work to use the Korg ( free ) style conversion kit as opposed to using the auto convert features of EMC, but based on the other EMC Korg conversions I've used, in the end I seem to get a better conversion with the Korg conversion software.
There was also a free Yamaha to Korg style auto conversion kit available on the Irish Acts forum a few years back. Not sure if it's still there, but I probably still have a copy buried on a CD somewhere here if anyone is interested.
To convert to Yamaha SFF, I've also always been able to do pretty well with both Jorgen's and Michael P Bedesem's free conversion apps, as well as OMB. The Casio MZ2000 has it's own auto convert function inside of the board, ( it works quite well ) but it only works with Roland and Technics based styles.
AJ
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AJ