Arturia beatstep pro User Manual page 13

If you don't have a ground loop problem in your setup, simply connect the BeatStep
Pro with the supplied USB cable to a computer or a USB power supply.
You should use the included anti ground loop adapter if you experience background
noise in your speakers that disappears when you disconnect the audio interface from
your computer or the CV/Gate connections to your analog gear. A ground loop can also
cause problems with pitch tracking when using the BeatStep Pro CV connections with
analog synthesizers.
Connect the anti ground loop adapter as follows:
ARTURIA – BeatStep Pro – USER'S MANUAL 13