Oh, I know all about that button :-) I even figured out a way to use a footswitch and MIDI Solutions modules to make this a MOMENTARY function. In other words- while you hold the pedal, it uses the lowest note to drive the bass, and as soon as you release the pedal, the bass inversion light goes out and you can play any inversion. [The default behavior requires you to press the pedal once to turn it on, and again to turn it off. Which I find hard to do quickly while playing a song.] The momentary functionality is great for songs which have one or two slash chords, and the others are minor or 7th. It took a lot of effort, and about $200 worth of hardware for me to figure this out. Roland, Korg, etc., should have menu options to make the bass inversion either "toggle" or "momentary" from the factory!

Even with Bass Inversion "on", Korgs recognize G played below C as Gsus4, and E below C as E#5 (E augmented.) That's why I'm asking for a software adjustment. For example: there could be a series of check-boxes to suppress certain two-finger shortcuts when bass inversion is activated. This would let me keep the ones that I find helpful, and still play many slash chords with just two notes. Of course, if majors can be triggered with a single note, it doesn't matter whether bass inversion is on or off. That's yet another way that one-finger majors add flexibility. Unfortunately Yamaha does not recognize single-note majors in their flagship "AI Fingered" mode.

At a minimum, Yamaha should add a check-box to their AI Fingered mode that says "Acknowledge single note as major chord" (instead of a unison like it is now.) Other people might be used to it the way it is, so I'm suggesting that this would be an optional, added feature. Really, I would like to see Yamaha's chord recognition modes comprehensively re-vamped. Things like Bass Inversion and Rootless should be individually selectable options available in ANY chord recognition mode except "single finger."

On the Ketron, a check box could be added, something like: "Require four notes for a sixth chord." That would allow us to play the more common minor 7ths in any inversion.

IMO all arrangers should have as much flexibility as possible in this uber-important area. Chord recognition is one of the defining features of an arranger. It also has implications for future sales. If the differences are significant enough, the learned "muscle memory" doesn't transfer well, so I might as well pick up a saxophone or guitar!