Hi fergal
Just started up my KPA to check if there´s a volume control in the delay display,
and the only delays with volume controls are the "Quad Delays" , "Harmonic Delays",
and a few others, so , as I mentioned in my first reply : it´s the "Mix" knob at the front
panel
You got me fooled there for a while
If you want to "bump up the overall volume" put a clean booster i "X" or "Mod" stomp box slot .
BTW , I´m running the steady as a rock OS 6.0.0 . Works perfect
Cheers !