sorry to jump in the middle of discussion:
i've got MPC3000 LE , SP1200,akai S950
and MPC1000 JJ OS2XL
so i can compare all 4 with each other
on the same samples & beat making workflow.
Here is short YouTube sound/swing comparison
that I've made between MPC3000 LE vs SP1200
using the same samples and the beat:
Hear it for yourself:
Obviously they both sound great but my personal preference goes to
SP1200.... even though it's the most limited of all 4 boxes

Here is YouTube video :
http://www.youtube.com/watch?v=GqOTuSTA2bUMPC300 / SP1200 / AKAI S950 / MPC1000 --->
They are all sound different and swing differently
for some reason MPC1000 sounds and swings worth of ALL of them

only with clever EQing it can sound reasonable ...
i am myself been trying to emulate SP1200 sound in MPC1000 by
using downsampling emulation FX + some subtle ring modulation
cause SP1200 starts to ring as soon as you tune sample up or down
And it rings differentely on each down/up step...
that's the most difficult part of SP1200 emulation ...
speaking of Swing : SP1200 swings different from MPC3000
but both of them swing great , while MPC1000 is somehow
swings less inspiring or exiting/lively.... its hard to discribe it
but,
most of
you probably know what i mean since you on this tread...

i would really like to see more vintage mode sampling and swing additions
to JJOS even as à trade off for some more modern functions ..
but just i don't see how JJ would implement them without having
all those real vintage mashines around for direct sound/swing comparisons ?