Time Modifiers

The following functions modify a pattern temporal structure in some way. Some of these have equivalent operators in the Mini Notation:



Synonyms: sparsity

Slow down a pattern over the given number of cycles. Like the "/" operator in mini notation.

  • factor (number|Pattern): slow down factor
s("bd hh sd hh").slow(2) // s("[bd hh sd hh]/2")


Synonyms: density

Speed up a pattern by the given factor. Used by "*" in mini notation.

  • factor (number|Pattern): speed up factor
s("bd hh sd hh").fast(2) // s("[bd hh sd hh]*2")


Nudge a pattern to start earlier in time. Equivalent of Tidal's <~ operator

  • cycles (number|Pattern): number of cycles to nudge left
"bd ~".stack("hh ~".early(.1)).s()


Nudge a pattern to start later in time. Equivalent of Tidal's ~> operator

  • cycles (number|Pattern): number of cycles to nudge right
"bd ~".stack("hh ~".late(.1)).s()


Multiplies the hap duration with the given factor. With samples, clip might be a better function to use (more info)

    note("c3 eb3 g3 c4").legato("<.25 .5 1 2>")


    Multiplies the duration with the given number. Also cuts samples off at the end if they exceed the duration. In tidal, this would be done with legato, which has a complicated history in strudel. For now, if you're coming from tidal, just think clip = legato.

    • factor (number|Pattern): = 0
    note("c a f e").s("piano").clip("<.5 1 2>")


    Changes the structure of the pattern to form an euclidean rhythm. Euclidian rhythms are rhythms obtained using the greatest common divisor of two numbers. They were described in 2004 by Godfried Toussaint, a canadian computer scientist. Euclidian rhythms are really useful for computer/algorithmic music because they can describe a large number of rhythms with a couple of numbers.

    • pulses (number): the number of onsets / beats
    • steps (number): the number of steps to fill
    // The Cuban tresillo pattern.


    Like euclid, but has an additional parameter for 'rotating' the resulting sequence.

    • pulses (number): the number of onsets / beats
    • steps (number): the number of steps to fill
    • rotation (number): offset in steps
    // A Samba rhythm necklace from Brazil


    Similar to euclid, but each pulse is held until the next pulse, so there will be no gaps.

    • pulses (number): the number of onsets / beats
    • steps (number): the number of steps to fill


    Reverse all haps in a pattern

      note("c d e g").rev()


      Applies rev to a pattern every other cycle, so that the pattern alternates between forwards and backwards.

        note("c d e g").palindrome()


        Divides a pattern into a given number of subdivisions, plays the subdivisions in order, but increments the starting subdivision each cycle. The pattern wraps to the first subdivision after the last subdivision is played.

          note("0 1 2 3".scale('A minor')).iter(4)


          Synonyms: iterback

          Like iter, but plays the subdivisions in reverse order. Known as iter' in tidalcycles

            note("0 1 2 3".scale('A minor')).iterBack(4)


            The ply function repeats each event the given number of times.

              s("bd ~ sd cp").ply("<1 2 3>")


              Samples the pattern at a rate of n events per cycle. Useful for turning a continuous pattern into a discrete one.

              • segments (number): number of segments per cycle


              Compress each cycle into the given timespan, leaving a gap

                  s("bd sd").compress(.25,.75),
                  s("~ bd sd ~")


                Plays a portion of a pattern, specified by the beginning and end of a time span. The new resulting pattern is played over the time period of the original pattern:

                  s("bd*2 hh*3 [sd bd]*2 perc").zoom(0.25, 0.75)
                  // s("hh*3 [sd bd]*2") // equivalent


                  Selects the given fraction of the pattern and repeats that part to fill the remainder of the cycle.

                  • fraction (number): fraction to select
                  s("lt ht mt cp, [hh oh]*2").linger("<1 .5 .25 .125>")


                  Synonyms: fastgap

                  speeds up a pattern like fast, but rather than it playing multiple times as fast would it instead leaves a gap in the remaining space of the cycle. For example, the following will play the sound pattern "bd sn" only once but compressed into the first half of the cycle, i.e. twice as fast.

                    s("bd sd").fastGap(2)


                    Carries out an operation 'inside' a cycle.

                      "0 1 2 3 4 3 2 1".inside(4, rev).scale('C major').note()
                      // "0 1 2 3 4 3 2 1".slow(4).rev().fast(4).scale('C major').note()


                      Carries out an operation 'outside' a cycle.

                        "<[0 1] 2 [3 4] 5>".outside(4, rev).scale('C major').note()
                        // "<[0 1] 2 [3 4] 5>".fast(4).rev().slow(4).scale('C major').note()


                        Plays the pattern at the given cycles per minute.

                          s("<bd sd>,hh*2").cpm(90) // = 90 bpm


                          Loops the pattern inside at offset for cycles.

                          • offset (number): start point of loop in cycles
                          • cycles (number): loop length in cycles
                          note("<c d e f>").ribbon(1, 2).fast(2)
                          // Looping a portion of randomness
                          note(irand(8).segment(4).scale('C3 minor')).ribbon(1337, 2)

                          Apart from modifying time, there are ways to Control Parameters.