I just played a double gig this weekend with the Audya, the solo voices are good for adding some melody and leads to the arranger section but by no means can it hold a candle to a software synth.
My main reason for the Audya is that I can go play a gig with just that keyboard, I don;t need a vocalizer, mp3 player, wave player or small mixer.
Of course the styles are very driving which helps everywhere
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