"Vocotron is a VST instrument plug-in for Windows that combines the functions of a sampler and vocoder. Vocotron’s keyboard is divided into two key zones, like on the classic Mellotron and Chamberlin ‘samplers’. However, the zone’s functions are slightly different: the left side reproduces samples and is a modulator for the integrated vocoder, and the right side sets the tone, it is the carrier for the vocoder." ToneBytes