jmc

Since $-4\le -4$, we know that $f(-4)=\frac{a}{b}(-4)=-\frac{60}{13}$. So, $\frac{a}{b}=\frac{15}{13}$. Next we look at $4>-4$, so $f(4)=ab\cdot 4^2=3120$. That means $ab=\frac{3120}{16}=195$. Now that we have two equations and two variables, we can solve for $a$ and $b$. From $ab=195$, we get that $a=\frac{195}{b}$. We substitute this value for $a$ into the equation $\frac{a}{b}=\frac{15}{13}$ to get $\frac{195}{b^2}=\frac{15}{13}$.

Next we cross-multiply and get $15b^2=13\cdot 195$. Before multiplying 13 by 195, we try factoring 195 and notice that 15 is a factor of 195, so we can rewrite this as $15b^2=13\cdot 13\cdot 15$. Finally, $b^2=13^2$, so $b=\pm 13$. The problem says that $a$ and $b$ are positive, so $b=13$ and $a=\frac{195}{13}=15$. The sum $a+b$ equals $\boxed{28}$.