Hi Dan,
software that would allow someone to edit/create ketron format styles would be incredibly useful.

For instance something similar to what korg has done for their styles. Maybe being able to save a style as a midifile, edit, and resave as a style.

Ok , I know you can use EMC XT style conversion, and do some very limited editing, but it's not perfect.
EMC removes multiple tempo changes in intro's/endings, which can sometimes make them sound off.
For some bizzare reason you also can't put an expression controller ( 11) on the first beat of a style part. Might not sound important, but I used to get large jumps in volume when I used to try & edit my sd1 styles in EMC.

Only reason I sold my sd1+ , was I gave up trying to edit styles for it.

best wishes
Rikki