A number of previous studies found that the consistency of sound-to-spelling mappings (feedback consistency) affects spoken word recognition. In auditory lexical decision experiments, words that can only be spelled one way are recognized faster than words with multiple potential spellings. Previous studies demonstrated this by manipulating feedback consistency of rhymes. The present lexical decision study, done in English, manipulated the spelling of individual vowels within consistent rhymes. Participants recognized words with consistent rhymes where the vowel has the most typical spelling (e.g., "lobe") faster than words with consistent rhymes where the vowel has a less typical spelling (e.g., "loaf"). The present study extends previous literature by showing that auditory word recognition is affected by orthographic regularities at different grain sizes, just like written word recognition and spelling. The theoretical and methodological implications for future research in spoken word recognition are discussed.