What is MTX? and what can it be used for?

Hello,

i have just set up my SQ5 an i see that there are something called Mtx, i wonder what is it and what usecases is it good for.

i’m sorry for my bad english but it’s not my first language

This is actually described quite well in the manual on page 43 (see also picture).
Google can help you translate the manual into your language.

Those are matrixes…

If aux/groups can be described as a mix of inputs, then matrixes can be described as a mix of outputs.