So this is a template I've been using a lot to play live, it may come in handy for lots of jazz guys who do left-hand bass gigs, but in general, can work for lots of split ideas.
The theory behind it is that each instrument track on the arrange will simultaneously control any number of Audio Instruments connected to it in the environment window. I've set up a few transformers, the most important one being the 'sus kill', which filters sustain pedal info from going to the bass instrument. Have fun with it, let me know if I can help or customize for anyone.
David, I know you'll like this one, it's the one I demo'd at our trainer class in L.A., with a few updates.
It's not tremendously jam-packed with features as my needs are pretty basic, but it's easily expandable.
Luis
www.logicprocorner.com
LiveSplits.zip
Template for playing layers or splits with one keyboard and multiple Audio Instruments.