Env 1 is rooted to the main filter, and the pulse width for oscillator A, B, C and D.
Env 2 is responsible for the Oscillator Pitch
Env 3 modulates the 12 db LP filter of the four oscillators
The four oscillators and two ring modulators have their own VCA (amplifier). If you turn all the way up it will stress the master and overdrive the synth! This is no fault but fully intend as you can create really sick sounds.