>>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. > I think you are both referring to the same thing, 2 LM13700 = 4 sections, total.. paul perry melb aust