Elektron Musical Instruments

ok further information if it helps:

I am able to significantly reduce, but not make silent, the tempo sync 
buzz if I unplug every audio connection between the Access indigo 2 and 
the MOTU 828mk2 that I had it plugged into.

As a matter of fact, the only thing plugged into the 828 now is the MD. 
  If I plug in an audio cable to both the 828 and the Indigo, the buzz 
returns.  No matter what jack on the Indigo (input, output).  Further 
it doesn't matter whether the indigo is plugged in or not.  The noise 
occurs even with the Indigo completely disconnected from everything and 
a midi cable is plugged between the MD and the Indy.

keep in mind all these are plugged into the same ground-lifted strip.  
I'm not even going out the MOTU outs at the moment, just listening in 
headphones.  I thought it didn't like my cables between the MOTU to my 
sub/x-over but that is all disconnected now as well.

The next test will be: does this happen with any other gear?

test subject will be a roland mc505 that i need to test before selling 
anyway.

result: no noise, the culprit is not the machinedrum but the indigo.  
however it seems strange, i will now test between the 505 and the 
indigo.

in this test the 505 was not groundlifted and was plugged into another 
plug across the room.  still no noise.

so man, wtf happened to the indigo.. oh well.

Thanks for listening,
Chris