Kick 2
The sine and sawtooth are being combined to create a waveform with a little bit of a tooth.
The noise is creating a click on the attack. Try it with different flavours of noise; some will bring out more click, while others will add more fuzziness.
Envelope A is only modulating VCA A CV.
Envelope B is modulating three things: the filter frequency, the noise amount (LPF CV), and oscillator A frequency.
Use the LP1 and LP2 filter modes for a crunchier sound.