Ok, the problem is with any synth that has a envelope interface (ADSR, whatever) on its Macro page.
Voltage, Trium and Auron are all affected. Just load their Init preset and try changing AMP envelope settings on the HALion Amp Envelope section – not on the Macro!
I did not try the Filter or other Envelopes.
The settings on the Macro page work, but not on the standard HALion Envelope > Amp page. Sometime the Attack an Decay work on HALion Envelope section as well, but the Sustain and Release parts ususally do not. They are disconnected.
Please investigate this issue.