Materia: Additive Re-synthesizer by AudioThing Free Download

Once a sample is analyzed, every partial can be adjusted by hand. You change its frequency ratio, amplitude and phase, then reshape its evolution over time with a 128-point envelope that has editable duration and sustain loop points.

Sync Partial Edits applies the same timing to every partial, which keeps changes consistent across the spectrum. Advanced Analysis gives each partial an independent envelope and sustain loop. Add Empty Partials lets you start from silence and draw new harmonic content.

Because the spectrum is editable at this level, Materia works as a sound design tool as well as a resynthesis tool.

Materia includes a flexible filter with low-pass, high-pass, band-pass, notch and formant modes. The FX section adds four processors: an algorithmic resonator, a tap echo, a multi-stage phaser and a waveshaper.

The resonator models materials including pipes, plates, glass, wood, stone, gongs, membranes and springs. Pairing it with the partial spectrum gives you a route from a recorded sound to a resonant, physically flavored instrument.