This is a Virtual Synth based on one of the best Analog Synths of the 80s, the Yamaha CS-80.
It has all the features of the classic synth plus some new characteristics. It has a modulation selector in wich you can choose the source and the destination with the ammount of modulation. It has a ring modulatos and a sub oscillator. Also you can set the touch response of the keyboard. It has a MIDI learning function so that you can choose wich knobs and buttons in your MIDI controller control different functions of the CS80.