★★★★★
The FB-3300 is a free software instrument that simulates the KORG PS-3300 Polyphonic Synthesizer from all the way back in 1977.
The interface seems incredibly overwhelming, with a seemingly endless amount of controls and functions, so there’s definitely a learning curve involved with this VST plugin.
The main features include: 3 independent polyphonic synthesizer blocks, band-limited oscillators and classic two-pole lowpass filters.