If you assign an LFO to modulate a parameter, make sure that the parameter is initially set low enough for the LFO to do anything. Example: Say you want to modulate the AmpVol with LFO1+ If your AmpVol is already set to 100, the LFO (see the little plus sign, that means it adds to the parameter value) won't be able to do anything to it because the value is already at its maximum. Lower the AmpVol parameter amount and you should be able to hear the changes now.