MSF 'modulating the decay parameter of an envelope (building block )by an lfo doesn't work

[gentleclockdivider]

Just one noise osc , followed by an envelope building block.
Trying to modulate the decay parameter for random decaying hi-hats
Tried both with a random source and or lfo ...no luck .

Edit : it seems that 'true random does work , but the lfo's do not .
I can drag an lfo to the(decay ) modulation page and enter settings but no luck .(screenshot 1)

When clicking on the (decay) modulation knob page directly , the lfo's are greyed out , unavailable (screenshot 2)

[David]

Mono LFOs work; I guess that's what the red-flashing receptor when you drag a PVoice one to the decay means. And I guess the receptor's there because some PV mods DO work, as you said.

[MeldaProduction]

Basically when you start a voice, the envelope is taken at its current state for that voice. That's why only relevant parameters are available. LFO's for instance do not make sense if only the initial value is relevant.