Yes, but
Then from my mics into my mic pre using XLR?'
is that a joke?
I mean, yeah, mic into the pre using xlr. You're not using vintage equipment, have you seen anything else in modern mics and pres?
Anyway, you don't
need those extra 6 trs ends, but you're not gonna find a dsub cable without them.
It's an 8 out format.
You would need to use two more of them anyway into a headphone amp if you want to use headphones, and that's what the singer's going to plug the headphones into.
You could circumvent the issue of the headphone amplifier with a mixer. All eight outputs from the Rosetta would go into the line inputs of the mixer and you could use the stereo send from that for your monitors, and use the headphone amp the mixer likely has built in.
You could also use the preamps on the mixer during tracking sessions where you want more than two microphones, since the preamp you're buying only has the two channels.
I know you said in this or another thread that you aren't some scrub who doesn't deserve the ridiculously expensive equipment you're getting, and I'm trying not to treat you like one, but have you really considered all these purchases?
I mean, I don't have anything even close to this complex or expensive a setup, nor have I ever worked in depth with one.
Someone like me shouldn't need to answer these questions for you.
I'm not saying you should or shouldn't invest in any of this stuff, and I really don't know anything about you or your experience level besides what you've posted about this stuff.
But the information you need is all out there, and IMHO it would really benefit you to start digging a little deeper into the research for this stuff before you buy it.
You're spending way more than a lot of people who've put out some great recordings have come close to spending on their whole kits, and you're doing it without knowing most of the ins and outs of the pieces you're buying.
I know it's easy for a big chunk of change to burn a hole in your pocket, but step back, breathe, and decide what exactly you need.
The money isn't going anywhere, and the prices are only going to go down on non-vintage pieces of equipment.
Just food for thought.