Roland VP-03 is a digital reimplementation of the original VP-330 Vocoder Plus, which was originally released in 1979. It has a combined human voice and string synthesizer which can be modulated using the built-in microphone or an external audio source if USB is connected. It is also possible to use a DI box to connect a line-level analog audio source to the microphone connector. Additional features include chord memory and a voice step sequencer which supports various creative modes.
The VP-03 is powered using batteries or an external power adapter. It also includes a built-in speaker for mobile use. It can be connected to a Roland K-25m keyboard unit or operated using the built-in ribbon controllers. The USB connector be connected directly to a Roland MX-1 mixer, or alternatively the MIDI input can be controlled by an external sequencer or DAW.