Peavey Triple X - line out

I am not a guitar guy. But I am trying to run my guitar players guitar through our PA, and his direct-out does not seem to be working properly. it is putting out a very low signal and is the same, no matter what the volume level is on the output volume control. It is a Peavey Triple X. Is it

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Peavey triple x front, Current gigging head. Custom grill: …

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What do you like about the triple x?

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