Dominique,
Thanks for the info. I was aware of the Behringer conversion, and considered it for a time, but I had tired so may "failed experiments" with other alternative keyboard solutions that i'm running out of space and money and patience. I now own a piano, an organ, a couple Chromatones and Axis 49s, a Janko Glockenspiel, and various Arduino and Midi boards and relevant software.
Now I'm looking for something that is portable and comes with a manufacturer or dealer warranty. Maybe a configurable button accordion??
As for methods, I started "converting" a method by G. Molineux, "The Junior Illustrated Piano Method", which I chose because it was Public Domain.
I had discovered that most beginner methods are primarily oriented to identifying and finding notes on the keyboard and staff. And most "beginner" pieces and exercises depend on the C-scale being all white keys, that is, thumb-playable, contiguous, at the same level, with the whole- and half-steps in the right place!
So I found very little that could carry over from a traditional method to an alternative keyboard and notation. And if you want to throw in a 12-step nomenclature to replace A B C D E F G, you are really starting from scratch.
My present state of mind is that:
* A human being can learn just about any instrument configuration, notation, and musical style.
* While a consistent instrument design and notation may eliminate some frustrations,
to actually learn to play music on an instrument (including voice) requires dedicated effort.
* To be successful, at some point a musician must acquire an understanding of the actual music,
including the higher-order structures of melody, harmony, rhythm, and form,
but these tend to get overlooked in beginning lessons due to the overwhelming complexity of instrument and notation design.
* Traditional notation and typical paper-saving print layouts do more to obscure than to expose the higher-order "poetic" structure of music.
Joe