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This paper proposes a technique for controlling singing style in the HMM-based singing voice synthesis. A style control technique based on multiple regression HSMM (MRHSMM), which was originally proposed for the HMM-based expressive speech synthesis, is applied to the conventional technique. The idea of pitch adaptive training is introduced into the MRHSMM to improve the modeling accuracy of fundamental frequency (F0) associated with notes. A robust vibrato modeling technique based on a moving average filter is also proposed to reproduce a natural-sounding vibrato expression even when the vibrato expression of the original singing voice is unclear. Subjective evaluation results show that users can intuitively control a singing style while keeping naturalness of the synthetic voice.