Estradion - 230 is created on base of the classical soviet synthesizer Estradin - 230.
A monophonic synthesizer Estradin - 230 contains 4 main sources of sound - 3 tone generators and the source of noise. Such external sources as electroguitar and electroorgan can be connected to the instrument. The filter of lower frequencies is intended for changing harmonic compound of signals of audible frequency in self-excitation condition. This filter can be used as fifth source of sound.