# Releasing an open source-sound engine for Strudel

> Source: <https://zaltz.klappn.com>
> Published: 2026-07-27 01:21:22+00:00

zaltz
Basement pressure
▶ play
Copilot
you
strudel
hydra
Copilot
strudel

```
setcpm(122/4)
$: s("bd*4").bank("RolandTR909").lpf(300).shape(.15).gain(.9).duck("2").duckdepth(.4)
$: note("a1 [~ a1] ~ [a1 ~]").s("sine").attack(.01).decay(.15).sustain(.7).release(.12).lpf(200).shape(.1).gain(.8)
$: note("[~ <[a3,c4,e4]!2 [g3,c4,e4] [g3,b3,e4]>]*2").s("sawtooth").attack(.004).decay(.2).sustain(0).release(.1).lpf(sine.range(700,1600).slow(8)).delay(.6).delaytime(.3689).delayfeedback(.6).room(.5).roomsize(6).gain(.32).orbit(2)
$: s("[~ hh]*4").bank("RolandTR909").hpf(6500).decay(.05).sustain(0).gain("0.3 0.42").pan(sine.range(.4,.6).slow(3))
$: s("~ ~ rim ~ ~ [~ rim] ~ ~").bank("RolandTR909").hpf(900).delay(.7).delaytime(.3689).delayfeedback(.55).room(.6).roomsize(5).gain(.3).orbit(3)
$: note("<a2 a2 g2 e2>").s("triangle").attack(1.5).release(2).lpf(sine.range(400,900).slow(8)).room(.8).roomsize(8).gain(.22).pan(sine.range(.35,.65).slow(6)).orbit(4)
```

setcpm(122/4) $: s("bd*4").bank("RolandTR909").lpf(300).shape(.15).gain(.9).duck("2").duckdepth(.4) $: note("a1 [~ a1] ~ [a1 ~]").s("sine").attack(.01).decay(.15).sustain(.7).release(.12).lpf(200).shape(.1).gain(.8) $: note("[~ <[a3,c4,e4]!2 [g3,c4,e4] [g3,b3,e4]>]*2").s("sawtooth").attack(.004).decay(.2).sustain(0).release(.1).lpf(sine.range(700,1600).slow(8)).delay(.6).delaytime(.3689).delayfeedback(.6).room(.5).roomsize(6).gain(.32).orbit(2) $: s("[~ hh]*4").bank("RolandTR909").hpf(6500).decay(.05).sustain(0).gain("0.3 0.42").pan(sine.range(.4,.6).slow(3)) $: s("~ ~ rim ~ ~ [~ rim] ~ ~").bank("RolandTR909").hpf(900).delay(.7).delaytime(.3689).delayfeedback(.55).room(.6).roomsize(5).gain(.3).orbit(3) $: note("<a2 a2 g2 e2>").s("triangle").attack(1.5).release(2).lpf(sine.range(400,900).slow(8)).room(.8).roomsize(8).gain(.22).pan(sine.range(.35,.65).slow(6)).orbit(4)
hydra

```
osc(5, 0, 1.4)
  .color(1, .2, .62)
  .rotate(H(saw.slow(4).range(0, 6.283)))
  .modulate(noise(2.5, 0), .22)
  .kaleid(2)
  .contrast(1.4)
  .mult(shape(4, .6, .6).scale(H(sine.slow(2).range(1.1, 1.5))))
  .out()
```

osc(5, 0, 1.4) .color(1, .2, .62) .rotate(H(saw.slow(4).range(0, 6.283))) .modulate(noise(2.5, 0), .22) .kaleid(2) .contrast(1.4) .mult(shape(4, .6, .6).scale(H(sine.slow(2).range(1.1, 1.5)))) .out()