Patches and discussion for Ensoniq VFX family

On page 2-6 in the owners manual in the 1st paragraph it states that 
Their are 20 presets in Rom memory. On page 2-8 2nd paragraph it 
states you can save presets to internal and cart only, nothing about 
Rom. Which is it,can you copy to Rom or is that just a temporary 
buffer or something, when you try to copy from this mode it seems to 
overwrite the presets in interior mode. Something doesn't make sense 
because one page says you have 20 presets for each, cart, Rom, and 
Int. and the other page says only cart and int. Which is right, and 
why. Thanks