Duty Arp

Purpose

Shift each row’s note length with a short cyclic pattern (up to 8 values, independent length per row). Each value lengthens or shortens the note the step duty view set for that step, one note length at a time through the 16 note lengths from 1/64 to 1/1: 0 is four lengths shorter, 4 is no change, 7 is three lengths longer, and the result stops at 1/64 and 1/1. The duty arp does not read the sequencer’s duty curve.

Interaction

Two-stage editor. LHS LP: overview of all 8 rows’ arp patterns (lit = active step, position colour = playing step, dark = beyond arp length), and the row/length selector. RHS LP: value editor for the selected row (column = arp step 1–8, row = value 1–8). Each RHS column shows one lit pad at the stored value’s height, not a filled bar; steps past the length keep showing their value in slate.

Shortcuts

LHS: overview side

Gesture	Where	Action	Modifiers
Press row R, col N	Where LHS LP	Action Select row R; a double-tap within 350 ms sets its length to N slots	Modifiers none
SHIFT + press row R, col N	Where LHS LP	Action Select row R and set its length to N slots immediately	Modifiers shift
Press row R, col 9	Where LHS LP col 9	Action Select row R without changing its length	Modifiers none
SHIFT + MUTE + press row R, col 9	Where LHS LP col 9	Action Reset: fill the pressed row’s arp with `5`, which leaves the step’s length unchanged	Modifiers shift+mute
SHIFT + SOLO + press col 9	Where LHS LP col 9	Action Randomise: selected arp fully random across values 1–8	Modifiers shift+solo

RHS: value editor

Gesture	Where	Action	Modifiers
Press	Where RHS LP	Action Write the pressed row’s value into the selected row’s arp step (column 1–8)	Modifiers none
SHIFT + press column N	Where RHS LP	Action Write the value and set the selected row’s length to N slots (this can shrink the length)	Modifiers shift
SHIFT + MUTE + press row R	Where RHS LP	Action Reset: fill selected arp with row R’s value	Modifiers shift+mute
SHIFT + SOLO + press row R	Where RHS LP	Action Randomise: selected arp gaussian around row R	Modifiers shift+solo

A stored length of 0 means one active slot, not disabled playback. Column 1 therefore parks the row on its first duty value. There is no off state for a duty arp: after a reset that first slot holds the identity value, which is why it behaves as “no arp”.