SYNTHESIZERS: EVOC 20 PS

The EVOC 20 PolySynth (short for EnVelope-controlled Vocoder) is Logic Pro’s powerful vocoder instrument, allowing you to blend the tonal character of one sound (the modulator, often your voice) with another (the carrier, typically a synth sound).

The result is the iconic “robotic” or “talking synth” effect used in countless pop, funk, and electronic tracks.

What Is a Vocoder?

A vocoder analyzes the frequency content of one sound (like a vocal) and applies it to another (like a synthesizer).
In Logic Pro, EVOC20 PS makes this process easy by combining a polyphonic synthesizer and vocoder engine in one plugin.

When you sing or talk into a mic while playing notes on your MIDI keyboard, EVOC20 PS filters the synth signal using your voice’s formants — creating the classic “singing synthesizer” sound.

Key Features

• Built-in polyphonic synthesizer with multiple waveforms (saw, square, triangle, noise).

• Vocoder section with up to 20 bands for detailed vocal filtering.

• Formant and resonance controls for shaping vocal character.

• Pitch tracking, unvoiced detection, and LFO modulation for expressive control.

• Built-in noise generator and formant shift for synthetic or natural-sounding textures.

• Can operate as:

  • A standalone synthesizer (no input signal needed).

  • A vocoder (voice input required).

  • A formant filter (for unique tone coloring effects).

Use It When

• You want to create robotic or “talking” vocal effects.

• You’re exploring funk, disco, pop, EDM, or experimental electronic genres.

• You want to teach students about signal routing, synthesis, and modulation.

• You’re designing vocal textures for modern productions or remixes.

• You want to blend human and electronic elements creatively in a track.