Hi,
I use Maschine as my master-clock into my A4 - then on to my EMX. Works really tight.
Using the A4 as master was not usefull for me, the clock was very unstable. The EMX had a better sync as master, but with the Maschine as master I get absolutely tight sync.
I have not upgraded my Maschine to 2.0 yet, but imagine it is going to be even more fun.
heybo!