turn off rev-x on ur-rt2 ?

When I play back a midi track on cubase, rev-x is automatically turned on, and I cannot find the way to bypass it.
The manual talks about a “hardware” button at the mix console. When I click that it just disappears and nothing happens.
I have installed the latest “tools for ur-rt2” and yamaha steinberg usb driver.
Any ideas?

in cubase, Press F4, in Output deselect UR-FX Bus output

That was it, thank you!