Technics Quartz Synthesizer

The DP-DJ151 allows your vinyl records to maintain a constant key (vocal) even when the platter rotation speed is changed by the Pitch slider.

Panasonic SL-1210M5G Quartz Synthesizer Direct Drive Turntable with Digital Pitch Control and Blue LED

Ask any professional DJ: Technics' SL-1200MK2 has been the turntable of choice for the last two decades (and running!).