added-value

added-value slips Messiaen’s added value into your rhythm.

In Technique de mon langage musical Messiaen names the valeur ajoutee: a short value added to an otherwise regular rhythm, a dot on a note or a small rest slipped in front of one, so the music limps deliciously and the meter never quite settles. Here each note draws two seeded chances at note-on time: with probability extend its release is delayed by one unit (the added dot), and with probability defer its onset arrives one unit late (the added rest). Because both decisions are drawn when the note starts, the same seed replays the same limp no matter how you release; see Seeds.

A note deferred into the future keeps its release ordered after it (the note-off is held to at least 10ms past the emitted note-on), so nothing sticks.

Parameters

unit= takes a duration string like "250ms" or "1.5s", or beats= against the tempo, never both; the default is "60ms". See Time and tempo.

Parameter	Type	Default	Range
seed	integer	required	any unsigned 64-bit value
unit	duration string	"60ms"	positive, "250ms" or "1.5s" form
beats	number	none (instead of unit)	finite, greater than 0
extend	number	0.3	0..=1
defer	number	0.0	0..=1

Example

miditool.kdl

input "Roland"
output virtual="miditool Out"

added-value seed=11 unit="80ms" extend=0.4     // two notes in five get the dot

Play something square and it comes back subtly lame: most notes as played, a seeded share hanging on just a little too long.

Try this

Add the rest as well as the dot. With both probabilities up, the pulse survives but the surface never repeats:

tempo 100

added-value seed=7 beats=0.25 extend=0.35 defer=0.25

A quarter-beat unit reads as a metric hiccup rather than a smear. Then shrink it (unit="30ms") and the same lottery turns into loose, humanized timing instead.