I would look at the websites to see how the admissions are done and also read about dual degrees when one is engineering. For Tufts, I suspect that a student who has completed the first year of engineering classes successfully was enrolled in the engineering program in the first place. It’s been a while since I looked at this, but that’s how it used to be… The course catalogs and degree requirements are online for most of these schools. Your research now will definitely pay off - this isn’t a double major but a dual degree. You may find a different path as you explore.
Btw, when we toured Union, we met some engineering students who were doing very interesting work with music and sound. Another one to dig into!