Figure it out yourself XD EDIT: Since it's featured.. Move the bow around. Click down while over top of the thicker bits of the strings EDIT: Press 1 and click a string to make a sound 1 fullstep higher than the original string EDIT: Andddd last edit for now: Pressing 2 and 3 works on the A String (3rd string from the left)
credit to @Embertail!