SPEAR (Sinusoidal Partial Editing And Resynthesis) version 0.7.1 is a free application for Windows & OS X for audio analysis, editing and synthesis.
The analysis procedure attempts to represent a sound with many individual sinusoidal tracks (partials), each corresponding to a single sinusoidal wave with time varying frequency and amplitude.
Something which closely resembles the original input [...]

The Technos Acxel Resynthesizer is an additive synth developed in Quebec, Canada during the late 1980s. Its architecture is based on sine-wave oscillators that are each assigned amplitude and pitch envelopes to form the component harmonics of a sound.
The major innovation of the Acxel was, according to Technos, resynthesis. The idea is to sample [...]