What are you finding confusing about this? The SYNC IN/OUT jacks are used only to synchronise with other devices that use a sync pulse to advance their sequencers (e.g. other Volcas, pocket operators, etc). It won’t work with the OT, and it also won’t output the drum sounds that the Volca Beats generates. The headphone out is the only way to get the sound of Volca into the OT.
Yes. Not sure what you mean by white noise, but the SYNC OUT basically only outputs a steady clicking sound.
The Microgranny is cool and all, but it’s very limited compared to the OT. It doesn’t have a sequencer, for one. You’ll have to sequence it externally, and you won’t be able to do this from the A4 (except from the onboard keyboard, but that’s live playing only).
It doesn’t really work with modular gear, unless you have a way of converting CV/gate to MIDI (someone correct me if I’m wrong but I don’t see any CV/gate input.
As others have said, slow down man! It’s not a race. Be prepared to spend weeks, months, even possibly years learning how to use these devices. You’ve picked some really complex gear, these machines aren’t something you can just turn on and use without getting to know them first. From your most recent OT video, I think you’re not quite getting some of the features of the audio editor (e.g. the zoom knob only actually zooms the display, it does nothing to the audio). Have a look at Cuckoo’s video on OT sampling again, he goes over it in great detail. It is exactly the same on mk1 as on mk2.