create/update 'music box.md' file

strudel/music box.md

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+
+```javascript
+await initHydra({detectAudio: true})
+
+noise(3, 0.1)
+  .color(0.6, 0.6, 0.6)
+  .rotate(() => time * 0.05)
+  .scale(() => 1 + Math.sin(time * 0.5) * 0.3 + a.fft[1] * 0.4)  
+  .modulate(
+    noise(2, 0.2),
+    () => 0.03 + a.fft[2] * 0.05 
+  )
+  .add(
+    noise(4, 0.15)
+      .color(0.9, 0.9, 0.9)
+      .rotate(() => -time * 0.03),
+    0.5
+  )
+  .brightness(0.35)
+  .contrast(() => 1.2 + Math.sin(time * 0.3) * 0.1)  
+  .out()
+
+setcps(60/60/4)
+
+$:xfade(
+  stack(
+    note("<[c4 d4 e4 g4 a4] [g4 a4 c5 d5] [e4 g4 a4 c5] [c4 e4 g4 a4]>")
+      .s("sine").slow(4).decay(0.5).gain(sine.range(0.3,0.7).slow(5))
+      .someCyclesBy(0.5, x=>x.transpose(-7)),
+
+    note("<[c4,e4] [d4,f4] [e4,g4] [g4,b4]>")
+      .s("sine").decay(0.5).gain(cosine.range(0.3,0.6).slow(4)),
+
+    note("c2 - c2 c3 - c2 - c3").fast(2)
+      .s("sine").gain(sine.range(0.3,0.6).slow(7)),
+  ).orbit(1)
+  .pan(cosine.range(0.3,-0.3).slow(4))
+  .room(perlin.range(0.3,0.6).slow(4)).size("3|2|4")
+  .lpf(berlin.range(300,2400).slow(13)),
+
+  sine.range(0,1).seg(32).slow(32),
+
+  stack(
+    note("<[e4 g4 c5] [f4 a4 d5] [g4 b4 e5] [e4 g4 c5]>")
+      .s("sine").decay(0.5).slow(3).gain(sine.range(0.4,0.7).slow(8))
+      .someCyclesBy(0.3, x=>x.transpose("<-7 2>/4")), 
+
+    note("c5 e5 g5 c6 g5 e5")
+      .s("sine").decay(0.5).fast(2).gain(sine.range(0.2,0.5).slow(7)),
+
+    note("<c2 d2 e2 c2>").fast(2).s("sine").decay(0.5).gain(sine.range(0.3,0.6).slow(6)),
+  ).orbit(2)
+  .pan(sine.range(0.6,-0.6).slow(5))
+  .room(berlin.range(0.2,0.7).slow(3)).size("2|3|5")
+  .lpf(perlin.range(100,2400).slow(11)),
+).delay("<0.4 0.6 0.8>").dt(0.3)
+  .dfb(0.7).fast(sine.range(1,3).slow(24)).postgain(1)
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+```