Band limited impulse generator based on B-Spline interpolation of order 3. For technical details of this and the other BlitB3 UGens see: Juhan Nam, Vesa Valimaki, Jonathan S. Abel, and Julius O. Smith Efficient Antialiasing Oscillator Algorithms Using Low-Order Fractional Delay Filters IEEE Transactions on Audio, Speech, and Language Processing 18(4) May 2010, pp 773--785
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