What is 'invert, and sync' in oscillator?

[Any Good Username?]

In Zebra 2 oscillator tap, there is invert and sync mode. And i looked at Zebra 2 manual, but it doesn't explain specifically.

so i'm posting this topic if anyone know what invert and sync mode does.

thanks

[3ee]

Both features require you to move/modulate some extra parameters in order to "work"

invert (it inverts whatever the osc wave to be combined with a phased copy), requires the osc phase/PW knob.
self-hard sync requires the sync tune knob "sync"

[Sendy]

This is all in the manual.