Free Download: http://vst4you.com/pages/vst%20instruments/avatar%20st.html
Avatar ST is most suited for a large variety of pads, soundscapes, atmospheres or related FX sounds but can do other sounds like e.g. certain kinds of basses too.
The 16-Step Modulator allows sounds to be fairly rhythmical in various ways if required. Also you can have one section step-modulated while the the other is not as there are two complete sections with oscillators, modifiers, VCA EG, Delay, Pan and Reverb send, plus a grain processor and a multimode filter to be inserted via different audio routings. In addition there are a lot of modulation options you might select from in order to tailor your sound.