Analog Synthesizer like Minimoog, but, with polyphony. For analog circuits use only OP-amps and typical bipolar transistors,for digital parts use 74xx TTL or CD 40xx CMOS Logic. External control - CV/Gate (one Volt per one Octave). 2 VCO - Saw, Pulse (with adjust pulse width); 16,8,4,2 registers. Noise Oscillator - white and pink noise. VCF - Moog style 24dB/Oct ladder filter with ADSR Envelope. VCA - Simple with ADSR Envelope. Voice assign circuit - TTL, CMOS, or AVR. Without presets...