Elektron Musical Instruments

Hi everyone,
like anyone owning the whole Elektron set up I guess, I'm freaking 
with MD and sidstation working all together. I've got a question for 
you then, and it concerns the sid anyway : how do I sync the wave 
tables with the sequencer, for them to stick to the bpm ? Is there a 
way actually ? I've set the Sid sync on external source of course, 
and when I go faster with the MD, the wave table goes faster too, but 
it's not set to the bpm from the start.
Anyone can help with that ? Hope I've been clear enough-
Yo-