Hi,
Megavoices are not in every 3000/Tyros style, but this is not the main problem.
Often the style is too large to be loaded or played correctly, I tried some Tyros styles at my 9000 and some has unwanted voice changes or interruotions. So some 3000/ Tyros styles may not work corectly at your 2100.
Another thing are the wrong voices. For example, the tyros seems to use for some guitars the same program change as used for trumpet in GM standard. So you have to revoice the 3000/ Tyros styles.
Better you look for 9000 and 2100 styles. Take a look to this http://www.technote.com/products.asp?catid=79&isparent=False&brand=
and this http://www.stylediskwarehouse.com/
Europeans can use this offer http://www.styles-music.com/
and these offers are in German, only http://www.d-o-o.de/shop/index.html http://www.hageshop.de/hageshop.html

and here are some free downloads http://www.psrtutorial.com/Files/YSintro.html http://heidruns-musikerseiten.de/psr9000/styles.php (German, but the most important words in English)


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Regards
RF