node-aubio
Node.js bindings for aubio, a library for audio and music analysis, synthesis, and effects. aubio features include pitch tracking, onset detectin, beat tracking (tempo), phase vocoder, biquad and IIR filters.
In order to use this module, you will need to have aubio installed on your system. See aubio's download page to find out how to get aubio for your system.
node-aubio uses ffi to load aubio's dynamic library and use directly the aubio functions as well as ref to access C pointers efficiently. To find out more about ffi and ref, read the Node FFI Tutorial.