Bell Tower Peal

How it's made

Source

a ring of tuned tower bells swung by ringers, each struck once per swing by an iron clapper. The strike is a 1–5 ms broadband click; heavy bells get a softer, lower-passed clapper than small ones.

Body

every bell is a bank of inharmonic partials relative to its prime: hum 0.5, prime 1, minor-third tierce 1.2, quint 1.5, nominal 2, then 2.5, 3, 4.2 and 5.4. Each partial is a pair of modes a fraction of a hertz apart (cast asymmetry), so tails pulse. Lower partials ring up to 9 s; upper ones die within a second. Bigger (lower) bells ring longer, scaling T60 with (reference / pitch)^0.5.

Pitches

the bells are steps of a major scale from the tenor upwards (1, 9/8, 5/4, 4/3, 3/2, 5/3, 15/8, 2), so every bell has a distinct, recognisable pitch and the tails blend consonantly.

Envelope and rhythm

change ringing. A row strikes each bell once; the next row follows after a hand-stroke gap of half a beat. "Rounds" repeats the descending scale, "changes" swaps neighbouring pairs on alternate rows so the order keeps shifting, "cascade" rolls fast and unevenly so strikes interleave heavily. Strikes overlap the 3–9 s tails of earlier bells, building a dense cloud.

Variation

`rng` jitters every strike by a few tens of ms (human ringers), strength and clapper; tuning is ±0.3 % per bell, and pans are fixed per bell around the tower so each pitch keeps its own place.

Space

the tower is heard from a distance, so the sum is air-absorbed (low-passed) and sent through a hall reverb; `distance` raises both the wet level and the absorption.

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