Thanks for the replies guys!
Interestingly, I swapped out for a cable of the
same type, just a lot shorter, and in a different position (away from lots of other
cables, and possibly some power lines).
The issues seems to have largely
gone, but could prob be better
It was stated in the RME Babyface manual:-
When using unbalanced cables with
the XLR breakout cable: be sure to connect the 'ring' contact of a stereo TRS jack, and
pin 3 of a XLR jack, to ground. Otherwise noise may occur, caused by the unconnected
negative input of the balanced input.
I'm coming out from a mains
powered Novation Nova synth.
So is / was prob a combination of the ground
loop and positioning. .
(just lastly, I didn't get an email notification
about these replies. I'm not sure if anyone knows how to fix that. 'Favourite'ing the post
didn't seem to have a effect)