Vanguard is a VSTi and AU software synthesizer by reFX. It is a virtual analog synthesizer with 3 oscillators, 32 waveforms, up to 10-times unison, a filter with a number of frequency responses, delay and reverb effects and stereo pattern controlled noise gate and arpeggiator, making it very popular among trance and goa trance producers.
Most functions can be automated, such as cutoff frequencies, resonance, ADSR, and LFO. Vanguard works with any VST-capable host.
This synthesizer is used by Headhunterz in some of his songs.