FM-Four is a simple VST instrument that recreates four operators FM synthesis with some improvements like good known YAMAHA OPL/OPL2 chipsets. FM-Four can produce wide range of timbres that are rich in harmonics.

Main features:

• 8 FM Algorithms.
• 4 operators with coarse and fine tuning.
• 8 waveforms per operator (Sinus, Half-sinus, Abs-sinus, Quarter-sinus, Square, Triangle, Half-triangle, Abs-triangle).
• Multimode LFO synced with BPM and with Random mode.
• 4 filters.
• 8 stage envelope generator for multimode modulator.
• Distortion.
• Internal chorus.
• Internal 10 bands equalizer.
• Easy control with pop-up menus.
• 64 factory presets.
• Built-in preset manager with ability to patch name editing.

In addition, VST automation and full MIDI Learning are supported.

http://www.youtube.com/watch?v=g_w6OXQb5uc