Analog in: works fine with Trinnov correction.
Yes, you can do height, or wides, as an example. Technique is to place speakers where you want more spatial definition, then calibrate. As we have more spatial acuity in the front, it makes a lot of sense in most rooms that are not long and narrow to setup a typical 5.1 array, then use the extra two channels for height or wides, or to fix a spatial problem. An example of this could be that there is a door, right where the left channel should go. The solution may be to place a speaker on both sides of the door, then have Trinnov correct the image. Same with height. If you have a low center, this can be off set by placing another speaker high. Requires re-calibration any time speakers are moved. When doing this, experiment with SPTL set to 2D and 3D for best results.
Two Trinnov calibrated rooms.
You are onto a great option, but it's limited to 5.1 and stereo as is, or 7.1 and stereo with adding a speaker switch, such as Niles SPK-1. I do this one- 5.1 + 2.1, without a speaker switch box. Only one calibrated room will play at a time, and cannot be done using Zone 2, which is designed for simultaneous use of more then one zone.
Here's what you do for 5.1 room + stereo room:
Both rooms can have subs, or not. Connect 5.1 speakers. Stereo will be connected to remaining amp channels. Leave multiroom OFF. Calibrate the 5.1 room as normal, with the stereo room speakers (and sub, if there)disconnected. This becomes memory 1. Then disconnect the 5.1 speakers, while connecting the stereo speakers to the remaining channels not used in the 5.1 configuration (don't share output connections with other room, except for the sub output). Run the calibration of the stereo room, store this in another memory, say 2.
Presets select rooms: To select which room plays, assign in Input Setup page 3/3 to the Trinnov memory for the room, in this case, POSITN 1 = 5.1 system, POSITN 2 = stereo system. Then set SPATL to AUTO, 2D or 3D. When you select the preset, the room will automatically be routed and corrected. Sub: if you have a sub only in the 5.1 room, all switching is automatic. If you have subs in both rooms, the sub output is shared, so only the subs in the room where listening should be on. Sub switching may be automated using a triggered switch box.
If you want quickly change the room an input is assigned to, you can do it using the Setup > /QUICK/ADJ. If you make a change here, it will be remembered by the system.
Here's what you do for 7.1 room + stereo room.
Implementing a full 7.1 room and stereo Is a bit more complicated, As it requires a speaker switch box, such as the Niles SPK-1, that uses the trigger output to switch between speaker pairs. A manual box can be used, with the downside of having to manually operate it every time you change rooms. You would follow the steps above with the added step of switching a par of outputs from the 7.1 room to the stereo room. See the 972 manual on assigning the trigger.
Two 7.1 rooms. This could theoretically be done using speaker switch boxes, to play one room or the other. Why you ask? I do a form of this between two rooms, one a dedicated theater and the other the main gathering area in my home. The theater- for movies, the gathering room- for listening to music in surround.
One benefit of Trinnov correction is that it works well on stereo speaker pairs: the correction uses the most sophisticated method used in correction used today: both FIR and IIR filters on all channels- resulting in full range correction on large speakers.