[Darryl Ramm]

Do one thing at at time and debug/confirm each step as you go.

Start by getting the output of the Eleven Rack going into an interface and being able to record that when you play a guitar into the Eleven Rack Guitar in. Once you know that Rig works, don't change anything in it except the Rig input.

Then get the output of your interface playing into the Eleven Rack Line input L. Make sure you switch the rig input to that input. Use the level meters at the far right of the Eleven Rack rig view on the front panel of the Eleven Rack to confirm you have signal going into the line in L input on the Eleven Rack (it will be low level but you should be able to turn it up in Pro Tools and see the meter move).

That is all there is to it, if it's not working something obvious is wrong like you have a faulty cable, or IO settings in Pro Tools or some similar setup wrong, but you have all you need right in front of you to debug that. if needed, trace signals from one end to the other. e.g. connect monitors to the line output of the interface you are sending the dry signal out on... do you hear anything, etc.

There is also nothing wrong with just switching interfaces when you want to reamp, or using Avid Eleven plugins.