Hi Van der Waal,
Not sure to understand what the question here.
With a MicroBrute in gate mode your VCA will be opened with no attack decay or release. When you use an Env to modulate VCA you can have various behaviours depending on the settings of the ADSR or AD.
With the minibrute 2 you can change the gate length using the sequencer (shift + left part of the keyboard) and also change Env using AD env.
AD env has 2 modes :
Gate:
The AD Envelope starts when a note is played/triggered
and proceeds to maximum level at the Attack rate.
The amplifier sustains at maximum level until the note is released,
and then the envelope enters the Decay stage.
The envelope will not reset completely to zero if another note is triggered before the Decay stage has ended;
it will resume the attack stage of the amplitude envelope and proceed to maximum level at the Attack rate.
From manual p39 :
Trig:
The AD Envelope starts when a note is played/triggered. There is no sustain stage ; the envelope enters the Decay stage after the
Attack time has been fulfilled. The full envelope will run unless another note is triggered,at which time
the amplitude resets to zero and the envelope starts again.
You can also modulate the VCA with any modulator using the patchbay.
I don't know if I answered you question here. Feel free to get back to me if you have further questions.