One thing that could be improved on with FM-X on the Montage/MODX synths is the variety of Algorithms available, especially with the 2 additional operators and how they are set as carrier operators in most of the algorithms. It would be great if Yamaha would add/provide more algorithms whereby they are stacked as carrier & modulator.
Having said that, over the weekend I took a 'voice strings' sound that I had programmed from scratch on my DX7II over 30 years ago, and decided to see if I could enhance it. I found another sound that has a 'ghost-like' sound to it and broke it down, stripping out all operators and LFO settings until it had just a basic 'Awww' sound. Turns out it was 2 Carrier operators that provide this. After adding them to my existing 'voice strings' sound, which had those carrier operators volume set to '0', adjusting the volume of the 2 new operators along with several other common and operator settings, and with the "Pitch Change" effect giving them a more Unison voice quality, it definitely improved my old 'voice strings' sound!
Having enhanced a sound that I thought was great to begin with, I can imagine the possibilities of enhancing other existing DX7 sounds if there were more stacked carrier/modulator operator algorithm options. If it is possible, this sounds like a good one for IdeaScale!