The synthesizer is free to use, but will only generate tracks up to 5 minutes. The user uploads data in the MusicXML format, which the Sinsy website reads to output a WAV file of the generated voice. Gender factor, vibrato intensity, and pitch shift can be adjusted prior to output.
Some users have praised Sinsy for its realism. This can be attributed to Sinsy's voice source being a TTS (specifically, HTS, also by the Nagoya Institute of Technology), a process known for producing human-like results.
As of December 25, 2013 the official creators of the Sinsy are Keiichi Tokuda (Producer and designer), Keiichiro Oura (Design and Development), Nakamura Kazuhiro (Development and Main Maintainer), and Yoshihiko Nankaku.
Matsuo-P (松尾P; m003e_beta) is an English voice that was released to the public on December 25, 2013 along with the version 3.4 release of the Sinsy website. Unlike other banks on the Sinsy website that were created using female voices, Matsuo was voiced by a male voice actor. Its voice can be heard here singing "Who's Crying Now". Matsuo-P's voice actor is a YouTube and Niconico user who goes by the name Koya Matsuo.