Hi
I made a version of this for Meta using :
The Grand 2
Waves IR 1 Convolution Reverb ( Sydney Opera House Impulse )
I reprogrammed the midi dynamics completely .. and did the whole thing in about 2 minutes.. so forgive me if its not quite what you intended meta - but i had no guidance on it.. so i went with what sounded interesting.. to make it realistic it would need alot more work programming
Hope its useful to hear it in more depth..
MetaWaltz
Joe Soap