I tried to do volume swells on the modfactor, with tremolo and wave shape adsr or envelope (whats the difference between adsr and envelope?) and it worked but not in a very usable way, can't adjust the speed of the attack or ramp of volume, also I think there's a bug in that setting the depth fluctuates on it own if i try to use brake/slow to change the rate i had the 2nd lfo dmod and speed on 0 too
let me know if you find a setting that works for volume swells