Hello Jason - thank you! Those vids are extraordinarily useful - I can match BM's instruction with what's happening, plus there's more infill. Certainly confirms the infinite nature of the system. It's the interaction of the various parameters (often totally unexpected) that that's my biggest problem. Can only be learned by experience, so early experiments are going to have random results! No pre-determined aim until I get the basics of what does what - that'll take a century or two ...
Keep in mind the linked tutorial is a preview. Eventually there will be some downloadable content like articles and the X7B(s) for the performance(s). I'm inferring this from the videos. I wasn't able to find the additional content myself (as of today).
Current Yamaha Synthesizers: Montage Classic 7, Motif XF6, S90XS, MO6, EX5R