The Akai PRO-502 is a vintage analog synthesizer produced by Akai Professional. It was manufactured in the 1980s and is known for its unique sound and versatile capabilities. The synthesizer features an analog VCO (Voltage Controlled Oscillator) with various waveforms, including sawtooth, square, and pulse. It also includes a low-pass filter, envelope generator, and modulation options like LFO (Low-Frequency Oscillator) and ADSR (Attack, Decay, Sustain, Release). The Akai PRO-502 was designed for professional musicians and has been used in various genres of music, including electronic, pop, and synthpop.