Started with violin as a child, still play. Bass was easy to nail notes on by comparison, still is. Both muscle memory and ear training are vital.
Contrary to what some others have stated on this thread, you most assuredly can and should intonate your violin, viola, cello, upright, whatever.
Contrary to what some others have stated on this thread, you most assuredly can and should intonate your violin, viola, cello, upright, whatever.

