[Cin] video track monitors

[Igor BEGHETTO]

> Can I put your tutorial video on the forum?

@Andrea_paz
my screencast is for community, then you can do what you want.
Please, put the credits to igor_ubuntu (it is a his goodtrick/workaround)
Thanks.

@Daniel
I agree with you to have in the patchbay track a button to temporarily 
enable/disable all Effects/Autos in that track to see before/after, but 
not "integrated into the mixer window", for me.

IgorBeg