That's very useful to know! But actually it's another problem that I am trying to solve. So, my mac is connected to an audio interface (Mackie), which I normally use for sound in and out. The Mackie, in turn, is connected to my speakers. Now, I want to use these speakers to play music that is on my DAP using the DAP’s DAC module. I know I could use a mixer but I don't have one here. So I was wondering if I could do something like this:
Mac sound input: SP1000
Mac sound output: audio interface
I seem to be able to set the SP1000 as sound output but not as sound input.