The Erica Synths Fusion VCO is an analog digital hybrid that employs two vacuum tube-based oscillators plus an additional suboscillator for added thickness. There is also a passive low-pass filter for even more bass. External audio can also be fed through the VCO to generate suboctaves of the input signal. Be prepared to dial your bass up to wicked.
Fusion VCO Features
3 basic waveforms (sine, triangle and pulse) with VC morphing, for example, triangle morphs from sawtooth to ramp