Definition
A vocal stack is a set of overlapping vocal tracks (doubles, harmonies, octaves, pads) that sounds like a single choral block. It is the sonic signature of many artists: Queen (Bohemian Rhapsody, 1975, with a number of vocal overdubs often reported at around 180), 10cc (I'm Not in Love, 1975, with a wall of voices sampled on looped tape), Ariana Grande, Billie Eilish and Finneas, Jacob Collier.
How many tracks
There is no right number: it depends on the effect.
| Goal | Typical tracks |
|---|---|
| Full pop chorus | lead + 2 doubles, 2–3 harmonies × 2 takes each = 9–11 |
| “Ooh” pad | 3–4 notes × 2–4 takes = 6–16 |
| Queen-style wall | 3 notes × 3–6 takes × multiple passes = dozens |
| Intimate stack (bedroom pop) | lead + whispered octave below + 1–2 single harmonies |
More takes of the same part = a more “choral” and wider sound; too many takes of the same part produce natural chorusing and a loss of definition.
Organization in the DAW
- A folder or group for the stack, with subgroups for each part (High, Middle, Low, Octave below).
- Clear names: “BV_High_L”, “BV_High_R”.
- A bus for the stack, where shared compression, EQ and reverb are applied.
- In FL Studio: the takes on the Playlist, each routed to a Mixer track, then all to a “BV” bus.
Panning
- Lead in the center (with an optional double in the center or at ±10–20%).
- Lead doubles: ±30–60%.
- High harmony: pair at ±70–100%.
- Low harmony/octave below: pair at ±40–60%, or in the center at a lower volume.
- Pads: spread across the whole field (each take in a different position: −100, −60, −20, +20, +60, +100).
Symmetry: for every take on the left, a different (not copied) take on the right; a copy gives a false image that collapses in mono.
Tuning and timing
- Recording: headphones with the right mix, each singer must hear the reference part; record the harmonies after the final lead.
- Tuning: correct with Melodyne, Auto-Tune (graphical mode) or FL Studio's Newtone. In stacks the correction can be more decisive than on the lead (imperfections add up), but leave variations in vibrato and note onsets.
- Timing: align word starts and ends and consonants with VocAlign (Synchro Arts), Revoice Pro or manually. Plosive consonants (t, k, p) and sibilants must coincide or be removed from the secondary takes.
- Formants: to vary the timbre of a take you can shift the formant (Melodyne, Soundtoys Little AlterBoy), which is also useful for creating artificial octaves below.
Mixing the stack
- HP at 150–300 Hz on the harmonies (the body stays with the lead).
- EQ: cut at 300–500 Hz to avoid mud, optionally air at 10–12 kHz.
- Compression: heavier than the lead (4:1, 5–8 dB of GR) for a uniform block.
- De-esser: firm, or sibilants cut by hand.
- Reverb and delay: the stack sits further “behind” than the lead: plate or hall with 1.5–2.5 s, short pre-delay.
- Volume: the stack bus is often 6–10 dB below the lead; in the final chorus it goes up 1–3 dB.
Common mistakes
- Too many takes on the lead: it loses personality and intelligibility.
- Harmonies with out-of-phase consonants: the lyrics become confused.
- All takes at the same stereo position.
- Identical pitch correction on all takes: robotic, flat sound.
Practice exercise
Record an 8-bar chorus: lead, two doubles, high harmony (2 takes), low harmony (2 takes), 3-voice “ooh” pad (2 takes per note). Organize everything in a bus, pan as described, align the consonants of the doubles with the lead and compare the stack in stereo and in mono.
Links
Doubles and Triples, Pop Choral Arranging, Vocal Production: Comping, Tuning, Timing, Stereo, Panning and Image, Layering.