White Noise Additive (WNA) is very interesting, it's approach is straight and you can get really good moving, evolving pads sounds with it, from all the range of additive synths today I found this one the best and easier to use, and you get lots of fun making the presets. It features formant morphing so you can use the same principles of vocoding to make your pads.
CPU usage is high, just as any other FFT synth, My CPU goes real high when playing 4 notes on my 1.6Ghz and that depends if I use Formant or not. But, still a great synth in my opinion.
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