The Akai PRO-501 is a vintage analog synthesizer module produced by Akai Professional in the early 1980s. It features a single oscillator with various waveforms, a resonant low-pass filter, envelope generators, and various modulation options. The module also includes a built-in sequencer for creating melodic patterns. The Akai PRO-501 is highly sought after by collectors and synthesizer enthusiasts for its unique sound and vintage charm.
