GTG FM 4 is an FM synth with a different structure. 3 operators with 2 mixable paths each. This free VST was released by gtgsynths and comes loaded with tons of presets and is capable of creating some amazing sounds useful for dubstep, trance, electronic, idm and hip-hop beats. Just copy and paste the VST DLL into your VstPlugins folder and load it into FL Studio. Download here.