Hi,

On Track 1 the ‘Audio To’ should be routed to Ext. Out 3&4, and on ‘Track 2’ the Audio From should be routed to Ext. In 5&6. This way all of the dry audio recorded on Track 1 will be sent through the H90 and back in to Live on Track 2.

If you’re recording a live performance through inputs 1&2 on the 18i8 then you would just need to set up the 18i8 so the source of Output 3-4 is Analogue 1-2. Then in Live you’d just need to set one track to record Inputs 5&6.

I would also suggest reaching out to Focusrite directly for tips on how to best use their hardware and Focusrite Control software with your setup.