HELP WITH RECURSIVE MODULATION

[subosc1]

For instance if I have amp attack set to 40 & I make assign 1 source lfo1, destination amp attack , -30. When I touch a key, will it start @ -30 then modulate to 40? Can someone post an example of starting @ the assign destination & modulating back to a destination that is set already. If I was trying to modulate cutoff. Cutoff is @ 50. & I use VEL-ON SOURCE , DESTINATION is CUTOFF & -20. When I press a key will it start @ -20 & modulate to 50. Can someone post up some graphs of what is happening during recursive modulation? I read both manuals & I wish they would take a little more time explaining this with more graphs & pictures. Maybe some formulas also.