> monitor switching to second monitors

Not possible, you would need an analog switch behind the analog output 1/2.

> Adding another headphone out to control room

ADI-2 Pro FS has no TM FX. So whatever you want to route in the TM FX control room needs to be done on the recording interface in front of the ADI-2 Pro FS.

If you want to route between Monitor 1/2, Phones 3/4 on the ADI-2 Pro via the TM FX control room / ARC USB on the recording interface in front of the ADI-2 Pro, then you need two things:
a) a recording interfaces that has two different digital outputs like AES and ADAT/SPDIF and
b) you need to place the ADI-2 Pro manually into AD/DA mode, because in this mode you can choose the source of the signal for both outputs on the ADI-2 Pro (1/2 for monitors and 3/4 for phones).

Best is to integrate the ADI-2 Pro behind an existing RME recording device with TM FX as I described here in a blog article, it also explains which recording interfaces are ideal for doing the switching between Monitors and Phones on the ADI-2 Pro FS from a connected ARC USB if you want that. The same switching functionality you can achieve also without the TM FX and/or ARC USB by using the remap key feature. All described herein:

https://www.tonstudio-forum.de/blog/ind … our-Setup/

3/4 is the phones output take it either for phones or for a 2nd pair of monitors.
The TS outputs on the rears are same signal as 1/2, this doesn't bring you further to switch 2 pair of monitors.

You can use a device like this behind Monitor out 1/2  of the ADI-2 Pro FS to switch between 2 speaker pairs:
https://www.thomann.de/de/mackie_big_knob_passive.htm                             € 66

There are also more expensive solutions from Mackie for up to 3 monitor pairs.

But the phones you connect then to the ADI-2 Pro FS not to the Mackie
(the bigger models also have a phones output of their own).

"3/4 is the phones output take it either for phones or for a 2nd pair of monitors"

So you can use 3/4 for a second set of monitors then switch between outputs 1/2 on the adi-pro 2 to outputs 3/4?.. So I can have main monitors on 1/2 XLR > Headphones on 1/2 (but can i mute monitors 1/2 and headphones 1/2 independently?) Can you listen to the headphones without the speakers being on?

I won't be using a monitor controller, that's what I want to avoid. ATM I use a Digiface USB > ADi8 DS MK3 > ARC USB and go directly to the speakers via AES, but as I'm changing speakers to analogue now i need this new option.

But AES doesn't send clock does it?... so the ADI pro will just get it's digital signal and then switch to the same sample rate automatically? What if I've got the ADI-Pro2 set to 96k to capture a summed and bus analogue out (first computer running at 48khz) will the ADI pro 2 always try and switch to 48khz on the AES input or can it be forced to stay at 96khz and ignore the digital in?

"This is not the intended use case I can not recommend that."

it's just unbalanced outs so why not? Question is can you switch the outputs of the ADi Pro 2 from 1/2 to 3/4, i see no reason not to run a monitor output on 3/4

Ok AES carries the clock, I wasn't sure, but my first question stands, will the ADI pro 2 always listen to the AES in and change the clock or will it be able to be forced to 96k and ignore the AES in? just so I can keep the AES plugged in but sometimes capture a 96k bounce on a separate computer via USB and monitor that outcome at 96 too.

I'm not going to use a monitor switcher, also I'm not really a gear snob but i've tested the old big knob and I can't say i was impressed with it.. wanna keep my signal clean straight to monitors.

ok but what about switching between xlr 1/2 and phones 1/2 is that possible? Also with slow ramp up?

My second monitors amp can accept different ohm and levels > maybe this won't be a problem, and yes of course I'd prefer xlr but I think I'd prefer to monitor through the same DAC, but perhaps as you say, using the digiface headphone outs could be a solution, but i was also after having more high res headphone outs in the control room.. at least two anyway.

no spare ADAT out's either, hence the AES route to the ADI-2 Pro FS... and also this optional capture of the Analogue master bus chain through a reference convertor.

but you must be able to turn the speakers off to listen to the headphones 1/2 and vice versa turn the headphones off while listening to the speakers? both on 1/2?

You can switch between front and rear outputs by pushing the front knob for a second. You can configure it to switch between rear and front 1/2, rear and front 3/4, rear and front 1/2/3/4, but not in a circle from rear to 1/2 then 3/4 then rear etc.

If you switch between rear and front 1/2 for your monitors you can still use the mute function in the Volume screen (press encoder 1) for 3/4, which then allows to mute/unmute 3/4 separately.

So the setup from your very first post is possible.