domenico,

do not delete the styles,if users do not like the syles they can removed from preset folder.

with the styles onboard they can see what they can do with qranger.(they most be a example for creating styles)

and for live styler the new version 11 can load soundfonts from FluidSynth

read this:
http://www.live-styler.de/home/?News

and if we convert the giga sound in MS to SFZ and make a GM2 set for livestyler 11 in MS we wil have better yamaha styles sounding