A Tube is core of this VCA
Used mini tube consumes not more energies as an average LED!
Work with +-12V and produces typical, smooth tube like harmonics and compression. Audio 2 is normalized to output = feedback. Feedback loop generates distortion and subharmonic sounds are possible.
Mode switch down is normal mode, up sets a bias and changes the behavior of tube and works as a wave folder with an octave shift.
Inspired by Ken Stone.