  Singing voice synthesis (SVS), as a specific task for generating the vocal
singing voice from a music score, has drawn much attention in recent years. SVS
faces the challenge that the singing has various pronunciation flexibility
conditioned on the same music score. Most of the previous works of SVS can not
well handle the misalignment between the music score and actual singing. In
this paper, we propose an acoustic feature processing strategy, named PHONEix,
with a phoneme distribution predictor, to alleviate the gap between the music
score and the singing voice, which can be easily adopted in different SVS
systems. Extensive experiments in various settings demonstrate the
effectiveness of our PHONEix in both objective and subjective evaluations.
