Function vocoder 

pub fn vocoder(
    props: Value,
    carrier_l: impl Into<ElemNode>,
    carrier_r: impl Into<ElemNode>,
    modulator_l: impl Into<ElemNode>,
    modulator_r: impl Into<ElemNode>,
) -> Vec<Node>

STFT-based channel vocoder.

Port of Geraint Luff’s JSFX Vocoder. Imposes the spectral envelope of the modulator signal onto the carrier signal using per-bin energy envelope following and overlap-add reconstruction.

Inputs

Index	Signal	Required	Notes
0	carrier L	yes	Left carrier channel
1	carrier R	yes	Right carrier channel
2	modulator L	yes	Left modulator channel
3	modulator R	yes	Right modulator channel

Outputs

Returns 2 outputs: vocoded left and right channels.

Properties

Key	Type	Range	Default	Notes
windowMs	number	1–100	10	FFT window length in ms
smoothingMs	number	0–2000	5	Energy smoothing in ms (high values = spectral sustain)
maxGainDb	number	0–100	40	Per-band gain ceiling (dB)

Example

use elemaudio_rs::{el, extra};
use serde_json::json;

let vocoded = extra::vocoder(
    json!({ "windowMs": 10, "smoothingMs": 5, "maxGainDb": 40 }),
    carrier_l, carrier_r,
    modulator_l, modulator_r,
);
// vocoded is a Vec of 2 nodes: [out_l, out_r]