hahaha, It is a little complicated, seems that all we do circles surrounding a theme. At less, it remained clear that 2400/2600 has not a user styles area (like PSRs, and like KN7) to load external styles. Also it is clear that external styles can't be played from floppy or sdcard, and they have to be loaded into panel memory. Perhaps all that is a little confusing because the way to manage styles is different to PSRs.
So, as Starkeeper would say, two things do not remain even clear:
First one would be how many styles can be loaded from sd card or floppy in panel memory?
Second one is if these loaded styles in panel memory remain into kb when the keyboard is put out?