anti-accent

anti-accent keeps everything soft, except one permitted thunderclap per window.

Late Feldman earns its rare fortissimo by withholding it: after long stretches at a murmur, a single loud attack rearranges the whole room. This effect is that economy as a governor. Every note-on above level is pressed down to it, except that once per rolling window of every one loud note passes untouched: the first candidate to arrive after the window has elapsed since the last allowance (the very first loud note of a performance is allowed, nothing having been spent yet). Notes at or below the cap pass untouched and never spend the allowance.

The window rolls from the last thunderclap, not from a wall clock, so the indulgences space themselves against the music rather than the minute hand. The effect is fully deterministic, the same playing getting the same thunderclaps; seed is reserved for future selection modes and currently draws nothing.

Parameters

every= takes a duration string like "30s", or beats= against the tempo, never both; it must come to at least one second. See Time and tempo.

Parameter	Type	Default	Range
level	velocity	30	1..=127
every	duration string	"30s"	at least 1s
beats	number	none (instead of every)	finite, at least 1s once resolved
seed	integer	0	any unsigned 64-bit value

Example

miditool.kdl

input "Roland"
output virtual="miditool Out"

anti-accent level=30 every="30s"

Play as wildly as you like: it all comes out at 30 or below, and roughly twice a minute your loudest impulse actually lands.

Try this

Stretch the window until the thunderclap becomes an event you wait for:

duration-lottery seed=5 mean="2s" min="500ms" max="8s"
anti-accent level=24 every="90s"

Long dealt tones at a murmur, and every minute and a half the piece is allowed one outburst. Notice what your hands start doing: knowing the allowance has recharged, you begin placing the loud note, which is exactly the discipline the effect is imitating.