Hi Frank,
I just don't get the problem. (Am I missing something?) Why do you have to send the right hand voice(es) through Jammerlive? Set up the controller so that it sends left hand (below the split point) to, lets say, midi channel 1 and right hand to channel 2. Now have Gigasampler use any voice you want for channel 2 (or you can use a second or third voice on channel 3 & 4 respectivally). Now have Jammerlive recieve from channel 1, and I don't know over which channels Jammerlive sends it's accompaniment (midi) signals (I suppose you can program them), but have Gigasampler use the voices you want for those channels (which is the accompaniment) lets say channels 8,9,10,11,12,13,14 and 15 (8 channels for your 8 part accomp.) Can't even a simple midi controller split the channels. I suppose that you can pick what should be sent over which channel from whatever program or controller.
Thank you.

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Jick