But isn’t there also some kind of hardware “slew” added after the actual software envelope output? Since it sounds kind of sluggish even with the lowest attack/decay values.. I can imagine they added that to smooth the digital (stepped) envelope output. They did the same with the filter cutoff: even when controlled externally using midi cc, the BS2 smoothes the changes to the cutoff.

So if this is the case, we might be able to mod that slew speed?