Route bpm change from TransportProcessor

src/TransportNode.js

@@ -30,6 +30,8 @@ export class TransportNode extends AudioWorkletNode {
         } else {
           tryEvaluate(this.app, this.app.global_buffer);
         }
+      } else if (message.data.type === "bpm") {
+        this.app.clock.bpm = message.data.value;
       }
     }
   };