Add packages/edo for Equal Division of the Octave scales

packages/edo/README.md

@@ -0,0 +1,41 @@
+# @strudel/edo
+
+This package adds EDO scale functions to strudel Patterns.
+
+## Install
+
+```sh
+npm i @strudel/edo --save
+```
+
+## Example
+
+```js
+import { n } from '@strudel/core';
+import '@strudel/edo';
+
+// E.g. edoScale for Gorgo-6 scale, 16 EDO, LLsLLLs
+// base note C3, large step size 3, small step size 1:
+// C3:LLsLLL:3:1
+const [baseNote, sequence, largeStep, smallStep] = ['C3', 'LLsLLL', 3, 1]
+const pattern = n("0 2 4 6 4 2").edoScale([baseNote, sequence, largeStep, smallStep]);
+
+const events = pattern.firstCycle().map((e) => e.show());
+console.log(events);
+```
+
+yields:
+```
+[
+    "[ 0/1 → 1/1 |
+      {
+        \"degree\":1,
+        \"degreeIndexes\":[0,3,6,7,10,13],
+        \"intLabels\":[null,\"S2\",\"d4\",\"N4\",\"s6\",\"s7\",\"P8\"],
+        \"root\":\"130.8128\",
+        \"freq\":130.813,
+        \"edo\":16
+      }
+    ]"
+]
+```