Alphatron is not just a simple VA synthesizer
instead in using a 3rd oscillator with
digital waves it does offer a lot more variation.
Thus it can do analogstyle sounds reminding of the
old Moog and Prophet days but also merge this with
the digital realm in various ways to achieve sounds
Atonoise 2 is a widely enhanced version of prior
Atonoise and is basically built around the modified
Mystify processors of the Avatar ST VSTi Synth.
Thus it can mangle up sounds to a great extend
beyond recognition. It can be used on virtually any
kind of sounds like vocals, drumloops, tracks and is
even suited for deep sample processing if very few
til no modulation is involved.
Both plug-ins are now available as freeware VST
plug-ins for Windows.