A Envloppe speed to change both Attack, Decay, Sustain, Release in the same time.
Enveloppe Global Speed
-
-
You can achieve that by routing one of the soft knobs to a MIDI CC, and in the modulation matrix route from this CC to Attack, Decay, Sustain, Release and whatever other destination you want. As these are more than three destinations you will have to use more then one modulation slot.