The Model 15's sine wave took high honors in a wave purity comparisonwhich is outlined on the humbuki site. The test compared three manufacture's analog outputs against a digital standard, theoretically pure sine generated using Csound. Go here for details: http://www.thumbuki.com/20070528/my-sine-oscillator-experiment.html
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Plan B scores high in Sine Wave compaison test
2007-05-30 by (i think you can figure that out)