Does tune have a long vowel sound?

Yes, "tune" has a long vowel sound. The "u" in "tune" has the same sound as the "u" in "flute," "cube," and "rule."

It's important to note that the spelling "ue" doesn't always indicate a long vowel sound. For example, in "due," the "ue" represents a short "u" sound. However, in "tune," the "ue" does indeed signify a long vowel sound.