The dub delay throw feeds a stab into a long filtered feedback delay whose repeats degrade and darken

The dub delay throw is the signature move of dub-techno (inherited from Jamaican dub): a chord stab or hit is sent into a delay with relatively long delay time, high feedback, and a filter on the feedback path that darkens each successive repeat. The result is a trail of echoes that degrades — each repeat quieter, darker, muddier — dissolving into the reverb tail. The movement comes from the degrading repeats rather than from new notes. This technique directly maps the Jamaican dub studio practice (King Tubby, Lee ‘Scratch’ Perry) of sending signals into tape echo units and sweeping the console.

Examples

Strudel: .delay(0.9).delayt(0.5).delayfeedback(0.7) — each repeat fades. Add .lpf on the delayed orbit to darken repeats. Glicol: ~del: ~stab >> delayms 500 >> mul 0.65 >> lpf 600 >> ~del (self-referencing feedback bus).

Assessment

Describe the two control parameters (feedback level and filter sweep) that distinguish a dub delay throw from a simple echo, and explain what happens to the sound if feedback exceeds 1.0.