[Bigduggieface]

If you choose to bypass the HD24's optical digital outputs and use an aux send from your mixer, little will change.

You'd need to connect a cable from your mixer's FX send to the input of your computer's interface. Open your DAW and start a new session. Create a new input track and insert your effect of choice. Make sure your DAW's input / output scheme is routed properly. Finally, route a cable (2 for stereo) back to your mixer to hear the effects.

This is basically the same scenario I described in my earlier post, but this is an analog connection, not digital.

The only bitch is getting the computer's DAW set up correctly. It sounds like a lot of steps, but each only takes a second once you understand the in/out scheme. It really is like connecting an effects unit as far as connections go, whether its digital or analog.