Hasgas Gevul

The Sefer Chasidim (#302) writes If you Lein the Torah with the tune

for Navie or Kesuvim,

or you Lein the Navie with the tune for Torah or Kesuvim

or you Lein Kesuvim with the tune for Torah or Navie,

You are Oiver on the Issur of Hasgas Gevul.