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It uses voltage sensing circuitry to adjust the chuff rate. With 0 volts a steady hiss of steam can be heard. Advance the track control slowly and the steam volume rises and starts to make a deep chugging sound mimicking the cylinders labouring. As you increase speed so a more mellow chuff is heard. Slowly reduce speed and the chuff rate slows. On stopping the loco excess steam can be heard for about 10 seconds and then dies down in volume to a quiet steam hiss .The unit has just two controls that, once set, can be left alone. One to adjust the starting chuff rate because different train motors have different starting voltages and the other is a volume control.
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