the sonic multiplier is a ring modulator with an internal sine wave oscillator which is a great source for modulating other waveforms…easy build, but a little glitch comes with R46…I replaced it with a 100k pot, found the sweet spot where the oscillator keeps running and then measured that value…(it was not the suggested change to 47k!)…oh and you can also CV the oscillator (2 inputs) and use it seperately…