The 9000Pro was about the last 'pro' arranger Yamaha made, wasn't it? The last 76, I'm pretty sure!
Way I remember it, didn't it have some issues with sluggish operation? Seems a shame that something that the blame for not being successful really lies at the feet of the R&D team (obviously bit off more than they could chew, or at least the CPU could chew!), not the consumer...
Who knows? If R&D hadn't banjaxed this one so bad, maybe Yamaha would still be making 'pro' 76 arrangers? I must confess I still find it odd that the entire rest of the arranger market (well, not Roland anymore, but they've abandoned the entire TOTL market for now - bet you if they get back in though, there will be a 76!) don't have a problem with 76's, but Yamaha, after ONE failure (that had nothing to do with the number of keys) bail on the whole sector...
_________________________
An arranger is just a tool. What matters is what you build with it..!