The 9000 Pro did have synthesis and editing capabilities, the synth engine was essentially an MU100R card inside the 9000 Pro and editing via the Pro's LCD screen wasn't easy. You could hook the 9000 Pro up to your computer and further edit the sounds with provided editing software but it would have been nice to have the 9000 Pro have full editing on board. Multi layer sounds each with their own envelopes, LFO, FX, filters, velocity, and more were possible.

With the PLG150-VL card installed the 9000 Pro had extensive synthesis capabilities but since the cards interface was very poorly supported (I stress poorly), editing via the 9000 Pro wasn't simple nor intuitive as it should have been. Once again you were forced to use computer software to edit with rather than edit directly from the 9000 Pro. When I spoke with Yamaha's Mark Anderson as to why they didn't develop the software further for better implementation of the PLG cards Mark told me Yamaha felt that users didn't want those features. I was a 9000 Pro owner/user and I wanted them. I doubt I was the only user who did want those features! I was left out in the cold and eventually Yamaha abandoned the 9000 Pro which was a real shame. The board sounded great, had an awesome key feel, expansion capabilities, and was built like a tank. Yamaha fell short with the 9000 Pro by not completing software fixes, limiting upgrades, and in general extremely poor customer support. Yamaha's poor support was enough for me to sell my 9000 Pro and move on to Technics which I really liked. Unfortunately Technics stopped making keyboards so I had to sell my Technics due to no future support. Many Technics users were sad to hear that Technics would no longer make instruments and had Technics kept going, I'm certain they would still be one of the top arranger keyboards made.