Hi, Saw and Pulse have noise at start. It is quite obvious if you see the waveform. I found it nice to initialize m_y1 to -0.46 in Saw_Ctor. 0.46 is about actual amplitude of Saw. But, I couldn't guess which value is good for Pulse. Seems it depends on the frequency. I just can say 0 is far better than 1. Anyway, could anyone fix it? Sorry if my English is too broken. Hisao Takagi