note-roulette

note-roulette spins a seeded wheel for every note: keep it, replace it, or lose it.

A coin decides each note, which is the chance operation as Cage practiced it: pass, replace, or silence, drawn fresh at every note-on, with your rhythm and touch left exactly as played.

The outcome is remembered per held note, so the matching note-off lands on whatever the wheel chose, and a silenced note takes its note-off with it: nothing hangs. The wheel is seeded: the same seed and the same playing land on the same outcomes, forever; see Seeds.

Parameters

pass and replace must sum to at most 1; the leftover share is the probability of silence.

Parameter	Type	Default	Range
seed	integer	required	any unsigned 64-bit value
pass	number	0.6	0..=1
replace	number	0.3	0..=1, pass + replace at most 1
lo	key number	21 (A0)	0..=127, at most hi
hi	key number	108 (C8)	0..=127

Example

miditool.kdl

input "Roland"
output virtual="miditool Out"

note-roulette seed=23 pass=0.5 replace=0.25 lo=36 hi=96

Half your notes survive, a quarter mutate into something from the middle five octaves, and a quarter vanish.

Try this

Make silence the main event. Only one note in five sounds at all, and half of those are not yours:

note-roulette seed=13 pass=0.1 replace=0.1

Then set replace=0 and raise pass for pure thinning: no substitutions, just gaps eaten out of your lines. For thinning that responds to how fast you play instead of a fixed share, reach for density-governor.