SINES Tools: Formant Shifter
(Change voices and instruments sounds by shifting and reshaping their spectral envelope)



1. Upload Audio File
2. Process
Formant Shift Factor: 1.0

(0.5 = Deep/Giant, 1.0 = Normal, 2.0 = High/Chipmunk)
Formant Contrast (Gap Filling): 1.0

(0.0 = Gaps Filled/Smooth Hill, 1.0 = Normal, 2.0+ = Sharpened Peaks)
Spectral Tilt (Brightness): 0.0

(-2.0 = Dark/Mellow, 0.0 = Normal, 2.0 = Bright/Thin)
3. Play & Save
Please upload an audio file.
Formant Shifter © 2026 by Christoph Reuter and SInES is licensed under CC BY 4.0