The final “i” follows the convention of being pronounced as a short vowel (/ɪ/), like in “mini” or “city.” This contrasts with words like “pie” or “die,” where the “i” is part of a diphthong (/aɪ/). Also, “MIDI” is an acronym where the letters form a pronounceable word without modification, and in such cases, a short “i” is more common when it’s in the middle or at the end of the word. Hence, “mid-ee” sticks to these phonetic rules