I think it is a great instrument that I don't know how to use to its fullest capacity. I only had 3-4 week to get 2 hours worth of muic in. The audienc found it good,
Comments About the Sounds:
I am a classical musician just beginning so I cannot comment with authority on some of the above questions. Flutes have to much vibrato for classicl purposes in mid-low range and then either get worse or sound like a penny-whistle.
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DLN Sound FM synthesis explanation and sounds for Kurzweil K2xxx