Struct RenderProduct 

pub struct RenderProduct {
    pub mono: Vec<f32>,
    pub stereo: Option<(Vec<f32>, Vec<f32>)>,
    pub layers: Vec<LayerStats>,
}

A finished render: the mono mid (what analysis and mono export consume) plus the true stereo bus when the document is a tracks mixer. Producing both from ONE render keeps the author/refine/export paths from paying the full synthesis cost twice. Plain documents carry no pair here — their stereo treatment (Haas / Wide) is applied at write time by stereoize.

Fields

mono: Vec<f32>

Mono mid signal: 0.5 × (L + R) for a mixer document, the render itself otherwise.

stereo: Option<(Vec<f32>, Vec<f32>)>

The panned, mastered stereo bus of a tracks document.

layers: Vec<LayerStats>

Per-layer contribution stats for a tracks document (post-fader, pre-master), captured from the same render pass.