[PTUser NYC]

You're making a couple different errors.

First off, you are sending to the device in a reasonable way, via a bus. You might want to set the output of that track to feed output 8 instead, so you don't hear the unprocessed vocal too, but either way is fine I guess.

At this point, Output 8 is being used, and the signal is getting to the outboard effect.

Then you want to return the outboard effect to an audio track so you can record the sound of the processed audio. That's smart.

Your error is how you return the thing. You're trying to use an insert to bring the signal back. This is wrong for two seperate reasons.

1) Audio processing that happens on an insert IS heard in the mix, but is not recorded, The track only records audio that comes in from the input, not anything across an insert. If audio from an insert WAS recorded, you wouldn't be needing a second audio track anyway, right? You'd just use an insert on the first track and record.

2) And insert is a SET of OUTPUT and INPUT. In an insert situation, output 8 (for example) sends the audio out, and then input 8 (for example) is used to return the processed signal. Since you're already using output 8 from the aux send, it obviously can't be used for an insert, hence the error.

What you want to do, is to send the audio to the processor, I suggest using the OUTPUT of the first track right to output 8, and then return the processor's output into input 8. Set the INPUT of the second track to input 8, and there you have it - audio coming into the second track which is processed and recordable. You don't hear the dry unprocessed signal from the first track at the same time this way either.