HI: Mario
The Reverb setting in the mixing console does not
lock in the PRO, But the Reverb Type does.

In the parameter lock screen it say's Reverb Type
and that's what locks.

At first when I seen the Reverb Return Level I was
thinking it meant the amount of Reverb, in (the settings
in the mixing console) but now I think it might mean
something else.
I hope someone can tell us what it means !!!!!!!!!!!!

Enjoying the 9000 PRO
Denny