When you specify the LFO to modulate the pitch of an Oscilator (or Oscilators) with an amount of +15. It takes the pitch on the Oscilator being modulated as a reference point (call it 0) and then changes the pitch from the pitch you have on the oscilator to a maximum level of that pitch+15. It does that following a given waveform, like sinewave, triangle (up and down) - in which case it would start with oscilator pitch, go up +15, and then come back down to oscilator pitch again,etc. And that's what Shape 1 and 2 means, the waveform that the LFO uses to modulate the parameter. How fast it does that, depends on the choosen rate for the LFO. I hope this helps you. Cheers
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