Hi
metz I am a bit of a Kurzweil fan
(to say the least) This is a hard one. The only way you are going to get those original K2000 ROM sounds is perhaps to use the actual machine.
Firstly I have just got the latest model now the PC3K but I still have a K2000R too. Now the new one has got the the original Orchestral ROM and the Contemporary ROM expansions buried in its own newer updated ROM. Apparently the Kore 64 upgrade has got the original ROM sounds in it. Which means it may be possible to get those sounds into something like
Chicken Systems Translator and convert over to something else.
You would need access to someone with a PC3K and has the Kore 64 expansion in to do this. I have never found the original ROM samples though as a separate thing either on CD or in any form. Once the original ROM samples come out that way then it will be possible to do what you want to do. I don't think Kurzweil are going to bother with the original ROM sounds so much. The reason is that there new ROM is amazing and WAY better.
Don't forget though it does not stop with the original samples either. There is the VAST processing and the internal effects which also have a big impact on the sound. You wont get that when you finally get them into a different format.
All the more reason why one should turn any midi tracks that are sequencing external synths into audio right at the time of the song production in case this very thing happens and you cannot play a synth part as you no longer have the instrument any more.
BTW the new Kurzweil sounds a lot better than a K2000. I never thought it possible but it is. It sounds ridiculous now!!
If you are really stuck you are welcome to send me any midi tracks and I will print the audio for them for you no problems. Its one reason I kept the K2000R to be able to do just that. Plus it still not a bad baby to have lying around!