HI i see in the video your using a black usb lead did this come with beatstep ? as mine are white. also do you have a way to plug beatstep into a usb power socket other than the pc ,say like an apple usb charger. to see if the double notes are still there , you must use the correct type of usb lead for connection to your pc and it could cause problems otherwise .
plugging into your pc could be a driver issue if you have not tried powering it from somewhere else.
let me know how you get on
ARTURIA Tester for Audiofuse, DrumBrute,spark,analog lab2,kl88,matrix12,semv,beatstep,minibrute.se,
ASC,Vcol4, Beatstep pro, VCOL5, Synclavier v.