This is a list of totally free vst plugins in the category chorus, flanger, tremolo  pitch and other effect plugins.  Chorus and flanger effects use a doubling (or x’ing) of the sound source with a slight change in pitch or an small added delay to the second sample in order to create a resonance beating. The tremolo simply is a repetitive change in amplitude of a sound source. Pitch effects are effects that influnce the pitch of a sound like for example pitch shifter or harmoniser.