patter1
  
  v.
  - make a repeated light tapping sound.
- run with quick light steps.
n.
 a repeated light tapping.
Etymology
  C17: frequentative of pat1.
 
  
    
patter2
  
  n.
 rapid continuous talk, such as that used by a comedian or salesman. 
▸rapid speech included in a comic song.
 ▸the jargon of a profession or other group.
v.
 talk trivially at length.
Etymology
  ME (as v. in the sense ‘recite rapidly’): from paternoster.