I have recently gotten back into playing upright after a long stint with electric. I purchased a student level instrument and have been pretty happy with the instrument tone overall. However, I run into problems when playing arco that I don't remember encountering when growing up. To be more specific, I'm having much more difficulty vibrating the string with a bow than I remember. Even when I really dig into the strings I will occasionally get a loud raspy tone. This issue doesn't seem confined to any particular string or spot on the fingerboard. It most often occurs when crossing strings to one which isn't already vibrating. Is this issued caused by my technique? Or could it be due to the type of string I'm using (which came with the instrument originally)? Any insight would be much appreciated as the current situation dampens my enthusiasm considerably.