Polyphonic, paraphonic, monophonic: what a synth’s voice count really means
Voice count sits at the top of every spec sheet and is often misread. What separates a polyphonic synth from a paraphonic one, and how to check before you buy.
“Four voices” appears near the top of almost every synth spec sheet. Two instruments with the same number can still behave very differently the moment you hold down a chord. It all depends on what a “voice” actually contains.
A voice is a complete signal path
On a subtractive synth, a voice combines one or more oscillators, a filter, an amplifier (VCA) and the envelopes that drive them. One note uses one voice; a four-note chord uses four. A monophonic synth has a single voice, which is exactly what you want for basslines and leads.
Polyphonic: one voice per note
A polyphonic synth duplicates that whole path. Sequential’s Prophet-5 is the classic example: in its Rev4 form, relaunched in 2020, each of its five voices has two analog CEM 3340 oscillators, its own filter and its own envelopes, and the Prophet-10 doubles that to ten. Korg’s minilogue and minilogue xd both offer four full voices.
In practice, every note in a chord gets its own envelope. Hold a chord, add a note, and only the new note attacks; the others carry on undisturbed.
Paraphonic: several pitches, one filter
A paraphonic synth plays several pitches at once but routes them through a shared filter and amplifier. It is a cost-effective design, especially with an analog filter: one circuit instead of one per note.
The Arturia MicroFreak is a textbook case. Arturia describes it as monophonic, paraphonic or unison, “up to 4 voices”, with a single analog filter. Its bigger sibling, the MiniFreak, offers 6 polyphonic or 12 paraphonic voices, so the same instrument changes character depending on the mode you pick.
How paraphony sounds
- Every note shares the same filter movement, so a chord moves as a single block.
- Depending on settings, the shared envelope may retrigger with each new note, restarting the attack of the whole chord.
- Evolving pads where each note breathes on its own are harder to achieve.
None of this is a deal-breaker. For bass, leads and short stabs, paraphony works very well. It becomes a limit if sustained chords are the core of your playing.
Other terms worth checking
| Term | Meaning |
|---|---|
| Unison | Several voices stacked on one note to thicken a mono sound. |
| Bi-timbral | Two sounds at once, layered or split across the keyboard, as on the Prophet-10 Rev4. |
| “Digital” voices | On a hybrid, check whether the figure covers the oscillators, the filter, or both. |
The habit to build: open the manufacturer’s spec page and look for the words “polyphonic” and “paraphonic”. Manufacturers use them precisely, as Arturia does on its MicroFreak page. How envelopes behave across voices is covered in our ADSR envelope guide.
My take
Paraphony has a poor reputation because it is often sold in small print, not because it sounds bad. A MicroFreak in paraphonic mode does things an entry-level polysynth cannot, and the reverse is true too. The real trap is buying a number. Ask yourself one thing: do you mostly play sustained chords? If so, go for true polyphony, even if it means stretching the budget. If not, the character of the engine matters far more than the voice count.
