Well my two tapped scanners are fed into Line In (I can't stand using Mic inputs, that's just me) and Unitrunker is reading off both. I do some
other monitoring on occasion of some
other digitally encoded signals (aka non-analog non-voice traffic), and it works great for me.
So, if you mean can you take the discriminator output on the 780 and feed it into the soundcard so you can run some decoding software on it and see what happens, the answer is most definitely
YES - the question then becomes:
What software will you use and what will you decode/monitor?