many many thanks for your help !
I think that for my guitar stereo rack,presets 2 in 4 out are useless,cause you can hear those presets coming thru the 2 Electro-voices from the Rivera TBR-1 without any difference in comparison with the same presets heard 2 in 2 out ! Quad out offers nothing more as stereo in my case,even with a different balance of the stereo image at input 3&4 versus input 1&2 of my Line Mixer !
I don't understand why the salesman -who knows my rack – advised me to put { H8000fw—Line Mixer} with 4 ANA OUT's in place of 2 cheers ! EMP