Inputing sound from Blueray , no output thru., but can hear in headphone output?

Unleashed

can see some similar questions but no clear way to turn on output

Unleashed

Komplete Audio2 , Mac mini M1, I have output from computer, but can't mix in from Inst/Line in.

Jeremy_NI

It's a little tricky to understand what you mean. So you're plugging your bluray player to the inputs of the soundcard and would like to hear it on the speakers? You need a DAW or an audio router to monitor the input on the main output (connected to the speakers). It's explained in this article: Using the Direct Monitoring Feature on My Komplete Audio Interface

You can use https://www.rogueamoeba.com/loopback/ for example.