- > **Sinsy** (**Sin**ging Voice **Sy**nthesis System) (しぃんしぃ) is an online [Hidden Markov model](https://en.wikipedia.org/wiki/Hidden_Markov_model "Hidden Markov model") (HMM)-based singing voice synthesis system by the [Nagoya Institute of Technology](https://en.wikipedia.org/wiki/Nagoya_Institute_of_Technology "Nagoya Institute of Technology") that was created under the [Modified BSD license](https://en.wikipedia.org/wiki/BSD_licenses "BSD licenses").[](https://en.wikipedia.org/wiki/Sinsy#cite_note-1)
>timbreIDLib is a library of audio analysis externals for Pure Data. The classification external [timbreID] accepts arbitrary lists of audio features and attempts to find the best match between an input feature and previously stored training instances. The library can be used for a variety of real-time and non-real-time applications, including sound classification, sound searching, sound visualization, automatic segmenting, ordering of sounds by timbre, key and tempo estimation, and concatenative synthesis.