Pulsing Tremolo Drone

How it's made

Source

a sustained electrically driven reed-like chord; eight additive harmonics per voice model periodic excitation, with weak band-limited pink friction underneath rather than transient strikes.

Body

D3-F3-A3-E4 forms a minor add-nine chord. Harmonics fall as 1/h^1.35; broad 620 Hz colour and a moving 0.8-3.1 kHz low-pass retain midrange weight without a piercing resonance or sub-bass bed.

Envelope

a raised-cosine tremolo never fully closes; squared pulses narrow smoothly for urgency. At 90/120/150 BPM, eight seconds holds 12/16/20 beats, with quarter, eighth or sixteenth pulses.

Modulation

pulse pressure opens the filter; an eight-second spectral swell changes upper harmonics. A quiet continuous fundamental layer preserves the chord through the valleys. No reverb is baked in.

Layers

centred root support, moderately spread chord voices, and independent stereo friction. Each voice has a weak companion offset by 0.125-0.375 Hz, producing slow beating without pitch wobble.

Variation

seeded partial phases and beat offsets; pitches snap to 0.125 Hz for eight-second cycles. Presets change tempo, pulse division, voicing, pulse width, depth and spectral reach for distinct uses.

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