The speed can be controlled by the pitch of a persons voice. The higher the tone the quicker the train will go If you would like to play around with it yoursel

The speed can be controlled by the pitch of a persons voice. The higher the tone the quicker the train will go If you would like to play around with it yourself then the code can be found here: https://github.com/benna100/duplo-train-voice-control https://github.com/benna100/duplo-train-voice-control