A recent discussion raised the topic of fingering patterns for the Hayden layout.
There is an aspect of the isomorphic layouts like the Hayden that I find a struggle - how to play from sheet music in different keys.
This is the Hayden layout for a 46 button instrument:
Lets assume that I have settled on a fingering pattern on the right hand for C major as follows:
1 2 3 4
1 2 3
where 1 is my index finger and 4 is my little finger, 1 starts on middle C.
Now I learn to associate a note on the staff with a (button,finger) pair on the keyboard so that I can see a note in C major on the staff and my finger finds its way to the right button. My finger knows where, for example, A4 is because of its relative position on the F4 row. Rewriting the fingering pattern to show the (button, finger) pairs, we get:
(F, 1) (G, 2) (A, 3) (B, 4)
(C, 1) (D, 2) (E, 3)
This approach works fine for reading and playing in C major, but what about other keys? G major would be:
(C, 1) (D, 2) (E, 3) (F#, 4)
(G, 1) (A, 2) (B, 3)
Three (button, finger) pairs stay the same:(C, 1),(D, 2)and (E, 3). The rest all change - four new pairs to internalize. As an aside, on an EC switching from C major to G major only involves internalizing a single new button pair for changing all of the F's to F#'s.
Each key change on a Hayden results in several such changes.
I obviously have the wrong mental model in my head for associating notes on a staff with buttons on the Hayden, but what is the correct mental model?
One cheat to get around this is to transpose the sheet music to C major/A minor but play the Hayden as if it were a transposing instrument. If I want to play in G major then read the score in C major but shift the fingering to start on G.
Actually, what I tend to do is to learn a tune in C and then use the 'virtual capo' feature of the Hayden to play it in a different key.
I hope this all makes sense and is not too stupid.