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
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
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