About the Waveforms
Most standard LFO waveforms are available for LFO modulation. You use sine and triangle waveforms for smooth modulation cycles, square and ramp up/down for different types of stepped modulation cycles and random or sample for random modulation. The sample waveform is different:
In this mode, the LFO makes use of the other LFO as well.
For example, if LFO 2 is set to use Sample, the resulting effect also depends on the speed and waveform of LFO 1.