What do "PM/AM/MIX/SYNC/FM" tripple oscillator settings do?

[Chappie]

I get that they're setting the way the oscillator processes the waveforms you've chosen but what does each do to the sound individually?
Why are they for osc 1+2 and osc 2+3? Is it changing the relationship between the two waveforms?

[musikbear]

I think most of this is explained in wiki
http://lmms.io/wiki/index.php?title=TripleOscillator

so, 3Osc : three oscillators. Each wave(s) can modulate an other through frequency (FM), phase (PM), sync or amplitude (AM). MIX combines two oscillators. (1+2 | 2+3)