Formants are the natural resonances of a singer’s sound production system. Like the size and shape of their throat, diaphragm, chest, and so on. Larger people have lower or deeper formants. Smaller people tend to naturally have higher formants to their vocal tone. 

Revoice Pro from Synchro Arts allows us to alter the formants of a vocal performance. This has many potential creative uses. In this video, see three scenarios where subtle formant shifting enhances the timbre of an otherwise natural performance.