A toy doll is articulated and removably attached to a toy scooter so that the doll’s arms appear to steer the scooter and the doll’s foot appears to tilt downward to push back against the ground and propel the scooter. A transmitter for transmits tire condition information and a signal processing time delay value in response to the first and second signals. This enables a larger amount of initial clearance to be built into the brake. The continuous-time quantization-noise-shaping circuits include adjustable circuit components for changing their quantization-noise frequency-response minimum, and the digital bandpass filters include adjustable parameters for changing their frequency passbands. The power electronics chamber is arranged at the second longitudinal end.