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Sound Doctor

You could use the stereo template as a start and change the main out to mono. Go to Setup, Config, Mixer config tab, touch LR on Main and list of options comes up, then select LR+M –
“A 3-way main mix with independent stereo LR and mono M buses. Channels can be separately assigned to any combination of LR and M. Typical application for M is main centre speaker, mono PA or bus-fed sub bass.”
Are you recording to the usb? Not sure if it has a separate volume control.
Have fun! I got my GLD about a month ago, having a blast so far.