The Lingo generates two 50 Hz sinusoidal waveforms which it amplifies and sends to the turntable motor – the Valhalla generates a single sine wave. Using crystal oscillators, one for 33⅓ rpm and one for 45 rpm, the two speeds are made possible. When depressed, the switch on the turntable supplies the start-up torque with which the deck's desired rotation speed is achieved. It also allows selection of the appropriate oscillator, the output of which is fed into a synchronous counter to produce a 50 Hz or 67.5 Hz square wave for 33⅓ rpm and 45 rpm respectively. The square wave is filtered into a clean sine wave to minimise motor vibration, and amplified to 120 V to feed the turntable.