Elektron Musical Instruments

I'm currently thinking of getting the MD. Could someone tell me 
what exactly is a Rhythm Echo.  Is it just another name for a 
DELAY ? I downoaded the manual but could not find the info.
So, can you program different repeats synced to the tempo as a 
nornaml Delay ?
I understand that it can be routed to any of the 16 tracks but not 
on  different steps of a track since it works as a master fx, right ?

Thanks for any comments,

Simon