His version based on the Thomas Henry BD++
My Doubleplusbass module is a dedicated kick drum with TEN knobs. Some of the component values need to be tweaked, as evidenced by this video, and my mixer may be clipping the waveform, adding some harmonics.
It’s a triangle-core kick drum, with a waveshaper that can take the signal to a sine wave, and beyond into a saturated sine and then the wave folds back on itself.
The decay has been decoupled from the pitch sweep, so the pitch sweep can be very sharp even with long decay times.
The pitch control response is exponential, so you can tune the kick more easily to that exact pitch, even if that pitch is very low.
There’s a CV input that can theoretically get a 1 volt per octave response with the CV attenuator knob carefully adjusted.
There’s an envelope signal available that can swing between about 10V and ground. There’s an attenuvertor on that control, which winds up basically moving the voltage offset from around ground up to about 10V, with the envelope signal fading out at about 5V, and then becoming inverted to go between an offset of 10V (to make your VCAs open up) and swinging down to ground (to make your VCAs close down). Good for sidechain.
schematic :
good quality here :
