I'm using a very obsolete Niles CPM -31 6x6 matrix to route sources to equalizers to pre or direct to amp in... however, it's very not ss and used carefully....
Bought new; mute everything prior to switching. Simple paranoia keeps self out of trouble...🤞 *L*
Can loop in/out a JVC JX-S777 video selector for that sort of activity, since the pre can deal with the a+v functions if the mood strikes...
Note; None of this 'switchery' is done under the influence of Anything.
A clear mind keeps the kit intact, and I use a distribution style amp that can drive 6 to 12 pairs simultaneously.....and is made to do that, Amp swap with no fear. ;)
If I was to go at it again, with the budget to do so....?
I'd chat up Maple Tree about their SCC-1 at minimum and don't cringe at the cost.
Save that for a custom quote for the one of your dreams...
Once considered diy'ng a matrix to replace the Niles; keeping the grounds isolated as well as the signal line just during layout would make you pause.
I've looked into full digital versions, shelved until I win a Lotto...
And a large one at that...
@panzrwagn is paying attention to level matches, which would be a boon.
Sudden loud can strike unintentional fear....as will *nothing*....