I hear Lfo even though I didn't apply lfo

[LydiaZ]

Hello, friends! I'm trying to make a pad in sylenth, and I'm a little upset by the resulting sound. it sounds like lfo has been applied, the rate of which is faster for higher notes and slower for lower notes. even though i didn't apply no lfo. This effect starts to be more prominent when I add 6 voices to my sine and turn up detune to like 30 percent. Is that why it is happening? Is it normal? So if I don't want this effect - that means I only get to use one voice?
All best, LydiaZ

[Lennard]

Try switching off the Retrig button, that'll make sure the voices are not retriggered at each new key you play.