Tzopilotl / Music Cookbook / 12. Live coding with proxies

going thru the Tzopilotl / Music Cookbook and was really excited for the Live coding section. Music Cookbook — Tzopilotl

when I run the example I get

→ [Future] : Future<Int>

?-> meaning that is needs a point on a clock to start maybe… but the text makes it seem that once node is set that a sound should play once given…
curious if anyone else is playing with this yet…