pavucontrol configuration trouble

[Thomas George <postbox.tg30@gmail.com>]

 I set the GP107GL High Definition Audio Controller profile to off but 
it continually reverts to High Definition HDMI Output which overrides 
analog output to my external speakers.

Today I found it impossible to turn this off. The off option is there 
put when I try to scroll down to it the option window closes before I 
can reach it.

Is there some way to permanently turn off this controller?