I think you guys slept on Linplug RMIV, you should hook this up with mpc's sequencer.
Features;
18 velocity sensitive pads
8 assignable outputs
groupcutting
pristine engine (lots of sonic richness here)
bitcrusher/distortion, compressor, Varizer (style, exactness and spectrum parameters) for each pad.
Fast envelopes for pitch, amp and filter.
10 drum algorithms (kinda based on 808/909) and loads samples of course.
www.linplug.com
This mpc emulating stuff is bs anyway, you can emulate its features which is exactly what a synth does in terms of (formant) modeling but with a very basic approach, so all them s/w oems are just riding the mpc's fame. You cant emulate the sequencer which makes the mpc appealing, so why not hook up a playback/editing engine on it since there is no alternative.