Spectral Magnitude Crossfade

Parameters

Lfo Rate — LFO frequency in Hz, 0.01–50. Controls how fast the frequency sweep cycles. Slow rates (0.05–0.5 Hz) produce slow morphing crossfades where different frequencies cross at different times; faster rates create more rhythmic frequency-staggered alternation.

Lfo Depth — How much the LFO modulates the per-frequency crossfade, 0–1. 0 = static crossfade (no sweep). 1 = full LFO control. Lower values produce subtle frequency variation around a static blend; higher values produce dramatic frequency-staggered transitions.

Bias — Center point of the per-frequency blend, 0–1. 0 = base position is full Source A; 1 = full Source B; 0.5 = center. The LFO modulates around this bias.

Center Freq — Center frequency of the sweep, in Hz, 50–10000. The frequency around which the LFO sweep is centered. Below this frequency the LFO behaves one way; above it, the opposite — depending on the sweep_dir setting. Typically set near the spectral center of your source content (1–2 kHz for vocal-rich material, 200–500 Hz for bass-heavy).

Phase Spread — How much spread the per-frequency phase relationships have, 0–4. Larger values produce more dramatic frequency-staggered transitions where adjacent frequencies are at very different points in their LFO cycles. Smaller values keep adjacent frequencies more synchronized (less dramatic but cleaner). 2.0 is balanced.

Additional controls

Shape — LFO waveform: Sine, Tri, Saw Up, Saw Dn, Square. Sine and Tri for smooth sweeps; Saw waves for one-direction sweeps; Square for hard alternation.

Sweep Dir — Direction of the frequency sweep:

• Low-High — low frequencies cross to B first, then mid, then highs.
• High-Low — high frequencies cross first, working down.
• Center — frequencies sweep outward from center_freq toward both extremes.

Each produces a different “feel” of the cross-spectrum transition.

Loop B — When on, Source B loops to match Source A’s duration. Off plays B once.

About Spectral Magnitude Crossfade

This node crossfades A and B per-frequency, with the per-frequency blend driven by an LFO. Different frequencies can be at different points in the crossfade at any given time — so a single moment might have the bass mostly on A, the mids halfway, and the highs mostly on B. The result is a sweeping, evolving crossfade where the spectrum visibly transitions across the frequency axis. Use it for: dramatic build-ups and transitions, creative DJ-style filter sweeps that double as crossfades, or sound-design morphs where you want to control how each part of the spectrum transitions independently. Compare with LFO Crossfade (uniform crossfade, no frequency dependence) and Multi-Band Crossfade (content-aware band-by-band crossfade without LFO sweeping).

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