There are actually four envelope types. The bandwidth one in SubSynth has identical controls to the frequency envelope.
This window shows a freemode enabled envelope. This is where all the normal controls have been assigned to fully editable target points. Not only that, but you can add points up to a maximum of 40. This allows you to develop extremely detailed and expressive envelopes.
The yellow vertical is the sustain/release point, and you can have new points both sides of it.
Envelope points can be MIDI-learned. However, instead of one learned line there will be two generated, marked for either the X or Y axis. For the point to be learned you have to make a distinct drag in any direction. If you only want one axis of movement you can either delete the unwanted line or mute it. Also, once learned you can separate the action of each axis simply by changing the CC number in the resepective learned line.