2hp Osc Black is an oscillator module for modular synthesizers in Eurorack format. The analog, voltage-controlled oscillator is a reissue of the legendary Curti CEM3340 IC, and many believe that this chip is the best-sounding analog oscillator ever.VCO offers simultaneous outputs for triangle, sawtooth and square waveforms as well as CV inputs for FM and sync and pulse width modulation. 1V/Oct tracking over ten octaves provides a wide frequency range for melodies or dramatic sweeps.