Hi Chadok,
If you mean Custom Styles it holds 20 together with 4 one touch settings for each style and also any Custom User Voices which are used in the styles themselves (not those played by the user in the Right 1, Right 2 & Left, voice parts. These voices are invisible to the user but enable the style to use custom user voices which may not be loaded in the Custom Voice Memory at that particular time.
Hope this helps - Best wishes,
Tony