Abstract : Key to effective phonics instruction is the teaching of graphemephoneme (GP) correspondences in a systematic progression that starts with the most frequent and consistent pronunciation rules. However, discovering the relevant rules is not a an easy task and usually requires subjective analysis by a native speaker and/or expert linguist. We describe GPA4.0, a submodule to the Transformer neural network model that automatizes the task of grapheme-tophoneme (g2p) transcription and alignment. The network is trained with four different languages of decreasing orthographic transparency (Spanish