I picked up Geist 2 in their recent 50% off promotion and came across something that didn't catch my eye when I demo'd it upon release. The 64 pad per engine allows for mapping all notes playable by an instrument to a single engine (for most things). I have used this for bass lines in the past but was forced to choose a key, but now all of the EB5 samples Craig did will all fit into one engine easily.
 
The engine presets have become significantly more capable, but I have not had an opportunity to play with them in great detail yet.