"Letted" is not a correct spelling in standard English. The correct past tense of "let" is "let" itself. However, "letted" is occasionally used in some dialects and informal writing. The IPA phonetic transcription of "letted" is /ˈlɛtɪd/, with the stress on the first syllable and the ending pronounced as "tid." Despite its occasional use, it is recommended to use the proper spelling of "let" for clarity and consistency in formal writing.