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The Yamaha CS2x is a sample-based synthesizer released by the Yamaha Corporation in 1999. The CS2x is designed for maximum real-time control, according to Yamaha. It is the successor of the very successful Yamaha CS1x. Enhancements include 64-note polyphony, a bigger sample ROM and a 24 dB/oct LPF/HPF filter. The CS acronym stands for Control Synthesizer.