This is a list of the analog synthesizers produced by Yamaha prior to the introduction of the DX7 digital synthesizer in 1983. * CS01: A small, portable and very basic monophonic synth. Battery powered and with a built-in speaker. Produced 1982; a Mark II version was produced in 1984. * CS-5: Basic monophonic synth with a single VCO and a two-pole VCF. Like most Yamaha monophonic synths of the era, it has Volts/Hz CV/Gate inputs for external control. Introduced in 1978 and produced until all production of analog synths ended in 1983. * CS-10: Monophonic synth with a single VCO and a multimode VCF. Produced circa 1977. * CS-15: Monophonic synth with two VCOs and two multimode VCFs. Can operate in a bitimbral mode when used with CV/gate control. Produced 1978-1983. * CS-15D