docs(website/learn/xen): add tune() examples

website/src/pages/learn/xen.mdx

@@ -0,0 +1,64 @@
+---
+title: Xen Harmonic Functions
+layout: ../../layouts/MainLayout.astro
+---
+
+import { MiniRepl } from '../../docs/MiniRepl';
+import { JsDoc } from '../../docs/JsDoc';
+
+# Xen Harmonic Functions
+
+These functions allow the use of scales other than your typical chromatic 12 based ones.
+
+### tune(scale)
+
+<JsDoc client:idle name="tune" h={0} />
+
+Here's an example of how to configure a basic hexany scale:
+
+<MiniRepl
+  client:idle
+  tune={`"0 1 2 3 4 5".tune("hexany15").mul("220").freq()`}
+/>
+
+Try other scales like `hexany1`, `iraq`, `gumbeng`, `gunkali`, or `tranh3`
+
+For a full list of available scales from tunejs, see http://abbernie.github.io/tune/scales.html
+
+You can set your root to be a particular note with `getFreq`
+
+<MiniRepl
+  client:idle
+  tune={`"4 8 9 10 - - 5 7 9 11 - -".tune("tranh3")
+    .mul(getFreq('c3'))
+    .freq().clip(.5).room(1)`}
+/>
+
+Some tunings become more pronounced with a longer reverb decay:
+
+<MiniRepl
+  client:idle
+  tune={`"<[5 6 8 10] - [5 7 9 12] -> -".tune("gumbeng")
+  .mul(getFreq('c3'))
+  .freq().clip(.8).room("3:10").rdim(10000).rfade(5)`}
+/>
+
+Additionally, you can combo this with `fmap` so that the base note changes:
+
+<MiniRepl
+  client:idle
+  tune={`"9 11 12 10 - - -".tune("gunkali")
+  .mul("<c3 c3 a3 d#3>".fmap(getFreq))
+  .freq().legato("2 .7").room("1:15").rdim(8500).rlp(14000).rfade(8)`}
+/>
+
+Combining this with various polyrhythm tricks can become very evocative:
+
+<MiniRepl
+  client:idle
+  tune={`"<[0 3 1 -] [-1 4 2 8]> ~ ~,<-4 -5>"
+  .transpose(4)
+  .tune("iraq")
+  .mul("<c3 d3 c#3>".fmap(getFreq))
+  .freq().clip(.5).room(1).rfade(9)`}
+/>