fix firefox keypress

repl/src/App.tsx

@@ -56,8 +56,8 @@ function App() {
         }
       }
     };
-    document.addEventListener('keypress', handleKeyPress);
-    return () => document.removeEventListener('keypress', handleKeyPress);
+    window.addEventListener('keydown', handleKeyPress);
+    return () => window.removeEventListener('keydown', handleKeyPress);
   }, [pattern, code]);
 
   useWebMidi({