Dual numerically controlled oscillator (NCO)
http://modcan.com/emodules/dualwave.html
many prefer the morphing terrarium for the smooth interpolation, I like this one better because of the detune feature and the fact that it can interpolate as well, but between two different waves of your selection!
Also the resolution on this one is amazing. really clear and precise even in the highest registers.
Having gone through most of the wavetable vco out there (no E352 yet), I have to agree that the Dual Wave is my favorite. The smooth interpolation thing isn't my particular taste but the limited interpolation between two voices with detuning and octave switching allows for more than enough timbral variety, Resolution is great and it definitely holds it down in the lower/higher registers
