>Hmm. My datasheet shows a tri VCO, but no waveshaper for sine. There is >also a 4 amplifier sine VCO. Mine is a National datasheet dated May, 1998. looking at my PDF file.... August 2000.... Figure 17 on page 15 is called "Sinusoidal VCO" - uses 2 LM13700. -Michael Buchstaller