Fixing some syntax and a typo

website/src/pages/learn/code.mdx

@@ -66,18 +66,16 @@ You can write your own chained function using `register`. Here's the above chain
 
 <MiniRepl
   client:idle
-  tune={`const effectChain = register('effectChain',
+  tune={`const effectChain = register('effectChain', (pat) => pat
-  (pat) => pat
     .s("sawtooth")
     .cutoff(500)
     //.delay(0.5)
     .room(0.5)
   );
-note("a3 c#4 e4 a4").effectChain()
+note("a3 c#4 e4 a4").effectChain()`}
-`}
 />
 
-Try adding `.rev()` after `effectChain()` to see further effects added.
+Try adding `.rev()` after `effectChain()` to hear further effects added.
 
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