David,

First, interesting question.
I went to the New Mixer clicked on Patches Tab, then clicked on
Instrument : 61 French Horn. Screen pops up allowing to to change
a lot of things including midi patch.
This was new to me.

Did sames steps on Old mixer. Worked same way.
This will get what you want, but it did confuse me(sometimes doesnt take much).

I have lost my GM2 setups with the 2014 upgrade.
Its probably there, but have to find check it out further.

FrankB

Down The Street vs2015 12-03-2014
Win7, AMD QuadA8-5500,16GB,2TeraHD, Komplete 10
PG Ultra Plus 2016,Alesis 12USB, Sonar Platinum