Both a Typescript-based library and a UMD build are available. stackmat.stop() may be called to stop listening for packets, without unsubscribing from any events. stackmat.off(TimerEvent?) may be ...

Do I actually need an external sound card, to allow my Stackmat timer, Gen 3 to be able to connect to my device as listed in title? I know everything else is a must, but not sure about this. Thanks!