Alesis Andromeda A6

Hi
I do my own sounds in the user bank on the A6, but I really want to 
get rid of the presets that came with the unit and replace them with 
something else (since I can't overwrite them, can I?).  Does anyone 
know of a good source of A6 sounds?  

Also, I am having trouble getting the sequencer or arpegiator to sync 
to midi.  I have followed the manual, but I am just not getting 
anything but the one note I press.  Any help would be appreciated.