Its a half step. Take a more careful read of the very page you cited. What they're saying is that a diatonic semitone is a semitone that occurs between different letter names: E to F or B to C. As for there being a difference, Greg is right that there is no sonic difference: a semitone is ALWAYS a half step.eport Abuse. Actually, a  Chromatic Semitone is a Half Step; however, a  Diatonic Semitone is a whole step. EX. E-F is a Diatonic Semitone EX. C-C# is a Chromatic Semitone Read More ... http://www.greenspun.com/bboard/q-and-a-...
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