Yeah, the MKS-20. Well it didn't turn out quite the way I expected, but you get the same feel from the sounds when you play it. The MKS-20 has the same voice arrangement, but they don't sound exactly like the RD-300. Piano 1 on the MKS sounds more like Piano 2 on the RD. Piano 2 is garbage all together. Piano 3 is identical to Piano 3 on the RD. Then you have your Harpichord, Clavi, Vibraphone, and 2 E. Piano's. They sound a little different on the MKS, but with some tweaks you can get it pretty close. The chorus is a little different on the MKS and I've yet to discover a way of making it sound exactly like the RD's chorus. Tremolo is about the same. I'm still happy with the MKS-20, but I feel like the RD-300 had warmer sounds and the chorus wasn't so "in your face".
Andrew, good to see you still visit this forum. It's hard to believe so much can change in just 6 years. I've learned a lot since then.
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Ryan