EDP undo button

[BCyayli@aol.com]

my new edp is just out of the box....when i press the undo button, it 
doesn't 
always undo the last loop....if it happens to work, when i hold the undo 
button down for a long time, to undo the next-to-last loop, nothing 
happens 
at all...does anyone have any insights?  is there something wrong with my 
edp 
or have i not figured out how to make it work?   signed, yet another 
female 
looper(-to-be)....beth