The robot on the radio

The vocoder chapter closes on "the casting is everything," and this recipe is the casting call. The sound has a documented pedigree — Bell Labs speech-compression research became, in musicians' hands, Kraftwerk's robot choirs and ELO's talking skies, and the machine has never left the radio since — but the records disagree on gear and agree on craft: a bright, busy carrier, an articulate modulator, and somebody enunciating like they mean it. All three are patching decisions.

Everything structural below is pinned by the kernel's tests and explained in the vocoder chapter: 24 bands, 50 Hz–12 kHz, everything you hear is carrier.

The carrier, built properly

The eternal failure is a dull carrier — high bands with nothing in them, consonants gone. Build it in three layers:

tap.vco~ (saw, f)        ──┐
tap.vco~ (saw, f, +7 c)  ──┼─▶ +~ ──▶ tap.vocoder~ right inlet
tap.noise~ (white) ─ *~ 0.1┘

• Two saws, a few cents apart (@shape 2, detune ±4–7): harmonics to the top of the range, and the beating keeps long vowels alive. Use the Moog recipe's stack values; skip the octave-down voice — vocoded speech reads clearest with the energy above the fundamental.
• The s and t budget. @sibilance 0.3 is the built-in version — a seeded noise source in the top bands' carrier, gated by the modulator's high-band envelopes, arriving exactly when consonants do. The manual alternative (a tenth of tap.noise~ summed into the carrier) remains the craftier option when you want to choose the noise color yourself.
• Pitch is the performance. The vocoder never changes the carrier's pitch, so the carrier's notes are the melody. Held chords (an mc. stack of carriers) make the robot a choir; a single line makes it a lead vocalist.

The modulator, cast against type

Articulation beats fidelity — the chapter's measured point is that band envelopes carry everything, so contrast between bands is what you feed it. A cheap dynamic mic is fine; compression helps; and over-enunciating helps more than any knob. Keep the modulator out of the mix — the machine uses it, nobody should hear it.

The three settings

q trades crispness against smoothness (narrow separates consonants, wide blends vowels); response_interval is the mouth's speed — attack and release in one knob. gain is linear makeup, and you will need some: a band-multiplied signal lands quieter than either input.

Two wiring facts that account for most dead patches: the modulator is the left inlet (a synth weakly filtered by your voice means the cables are backwards), and a silent carrier is silence no matter how loudly you speak — pinned by test, and the fastest debugging question in vocoding.

The songbook

The famous "vocoder songs" are the best syllabus for the craft — partly because several of them aren't vocoders, and knowing which is which teaches more than any preset. Provenance below follows the part's rule: documented where it's documented, labeled reconstruction where it isn't.

"In the Air Tonight" (1981) — the ghost choir

What's documented: Phil Collins ran the verse vocal through a Roland VP-330 — a soft vocoder, voiced like a string machine, mixed under a nearly whispered dry vocal. The reconstruction: this is the anti-robot patch. Carrier: two saws, detune ±4, imperfect 0.3, no noise layer — sibilance is what you don't want here — through tap.svf~ (@type lowpass @frequency 4000) to take the glass off. Vocoder: q 8–12, response_interval 120 — wide bands and a slow mouth blur the consonants into breath. Mix the vocoded return under the dry voice, a shadow rather than a double. The dry whisper carries the words; the vocoder carries the dread.

"Mr. Blue Sky" / "Mr. Roboto" / "Intergalactic" — the front-and-center robot

ELO (EMS vocoders, documented), Styx, and the Beastie Boys are the talking-synth patch played as a lead: bright carrier, crisp bands (q 20–30), fast mouth (response_interval 15–30), and the melody in the carrier's held notes while the words ride the modulator. Kraftwerk — the genre's founders, on custom and commercial hardware across the years — sit here too, usually with a single unison line rather than chords: the robot speaks in monophony. Enunciate. Then enunciate more.

One label to keep straight: Zapp, Roger Troutman, and the P-Funk talkbox records are not vocoders — a talkbox pipes the carrier into the performer's actual mouth and the room mic hears real articulation. Chasing that sound with this object gets you a cousin, not the thing.

"Hide and Seek" (2005) — the one that isn't a vocoder

What's documented: Imogen Heap sang into a harmonizer (the DigiTech Vocalist lineage), a keyboard choosing the chord — so every sound on the record is her actual voice, pitch-shifted into harmony, breath and formants intact. That's why it doesn't sound like a robot; there is no carrier. Three routes, honestly ranked:

1. The right tool — tap.harmony~. This record's mechanism is exactly what the object does: formant-preserving voices holding a chord over the aligned dry voice. Its recipe — with the Bon Iver patches that extend the lineage — is A choir of one. (This object exists because this section's first draft had to work around its absence; the audit worked.)
2. The manual fallback — a shifter stack. Voice into parallel tap.shift~ objects at chord intervals (tap.semitone2ratio feeds their ratio inlets). Keep the voicing within ±7 st — plain granular shifting moves formants with the pitch, and wide intervals go chipmunk where the formant-corrected routes don't.
3. The vibe — the choir patch above. Speak-sing into the choir row's settings with an mc. carrier holding the chords. It will sound like a vocoder doing Imogen Heap, which is its own valid sound — just don't mistake it for the record's mechanism.

The plugin-era default — an Orange-school carrier

The late-90s software vocoders (the Orange Vocoder the most loved of them) changed the default sound of the effect: where hardware vocoders leaned on whatever synth was nearby, the plugins shipped with a built-in, very bright virtual-analog carrier — so "the plugin sound" is really a carrier voicing: wide, glossy, present. One honest line first: that plugin is still a shipping commercial product, and the house provenance rule applies — nothing here reverse-engineers it. What follows is our bright VA carrier in that school, built from this package's own oscillator:

tap.vco~ (saw, f,   detune -6, seed 11) ──┐
tap.vco~ (saw, f,   detune +6, seed 22) ──┼─▶ +~ ─▶ tap.svf~ (highshelf) ─▶ carrier
tap.vco~ (saw, f+12, gain -6,  seed 33) ──┤
tap.noise~ (white) ─ *~ 0.08 ─────────────┘

All three oscillators @shape 2 @imperfect 0.2 @jitter 2; the octave-up voice adds the gloss the era is remembered for; tap.svf~ @type highshelf @frequency 6000 @gain 4 is the sheen. Vocoder settings: q 25, response_interval 20. Play the carrier in fifths and octaves rather than full triads — the brightness supplies the width, and triads in a bright carrier smear the consonant bands.

When to leave the recipe

• You want tuned speech, not a played carrier — the corrector (tap.tune~) moves the voice itself; the vocoder wears the voice over something else. Different identity theft.
• You want formant-shifted or gender-shifted voice — that's spectral surgery, not band gating; the corridor starts at tap.spectra~.
• You want intelligibility above all. Twenty-four analog-style bands are a voice, not a spectrograph; if every syllable must survive, dry speech mixed under the vocoded double is the radio trick that always works.