Have you tried a Badcat Unleash? I have one as my attenuator but I use it to bring the volume up if needed on my amps. I own the Origin 20H and all of my gigging amps are 20 watt Marshall heads. The Unleash has 2 volumes that can be switched like 2 channels that will give you a true volume boost. Like the previous poster said, where you have the amp set it has run out of room.