Carolyne,

I have a Pro24 DSP. I also just bought a Scarlett 18i20.

The key thing to learn about using these preamps is the MixControl software. And yes, it takes a while to "get it". I had three days to learn it, and up until the night before my live session (10 channels of live audio), I was still figuring it out, so I know it's tricky. I am far from mastering it, but once you start to, you find that it is pretty powerful as you can set up a variety of monitor mixes on various tabs to quickly change what to monitor at the headphones or monitor outputs. Don't give up. This is a good piece of hardware!

It's all about signal routing through MixControl. You have to choose what inputs to the Pro24 you want to monitor, and where you want to send them.

Also,note that I think MixControl defaults to stereo pairs (two channels with one panned hard left and the other panned hard right). You might have to select "Loop Back" depending upon what you are doing.

Watching some tutorials helped me a bit, but I did have to contact Focusrite support (the chat line helped me resolve my clock issues) to get past a stumbling block.

https://www.youtube.com/results?search_query=saffire+mix+control+tutorial&sm=3

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In the end, we will remember not the words of our enemies, but the silence of our friends." -Martin Luther King Jr.