Yeah, I know Roland claim their GK2B works better than ever before, but they've been saying that for 20-odd years... What I'm thinking of is the system Wal, then Peavey fitted into the fretboard. I went to the demo tour for that in 93, was quite impressed, then needed a quick drink after being quoted the cost (any excuse...).
It all went quiet after that, so I was wondering if anyone knows anything about the current state of play with this stuff, 'cos putting "midi + bass" into our search engine results in 4 million pages of DJ gear!