I assume you have the interface setup already...

So you go to the I/O page under song/setup.

You add stereo or mono channels to the I/O and you can name them.

So you label one FXsend then click the check box that will send that to the right output.

Look at the pic of the I/O on this page.

https://s1manual.presonus.com/#Setup_To ... Output.htm

Across the top are your hardware outputs, down the side are software channels.

You create a software channel then use that for the output of a track and that's where the signal will go, to the output you setup.

I know you are trying to help me but I really don't understand what you are saying. The FX send is confusing me. I know how to get to the I/O page of the 1818. But I don't understand how to make the bass on track 2 to come out of output 3 and the drums on track 10 to come out of output 5.

Sorry.

So in the image to the left I created a new output channel and named it FXsend.

That's what I would do with an external FX unit.

I only have the I/O to send it to two places, but you send it to where you want it to come out.

Then on the right I choose that output to send the whole track to, so I switch it from Main to FXsend.

That will send that track to the hardware output you chose in audio I/O setup.