Hi whyme6181,
If the volume going to Audacity is low, you can use the direct output trim to boost it.
To change to the direct output, go to Setup > IO Patch > USB audio and change from insert out to direct out.
You can now select a channel you’d like to boost and press the Routing key to change the direct out trim.
In Audacity, you will need to set up a stereo input track and source from channels 17 & 18 to receive the LR mix.
If you’d like me to go through this with you, please start a ticket at support.allen-heath.com and I can help you there.
Thanks!
Alex