Oh I see. NOK. well some one does,

me.
Im not hating just saying as some one that uses hardware compressor/gate/limiters it needs a side chain input for ducking/de-essing or differential compression.
Yes all you need is one signal signal, split thwn one compressed and one not compressed, then summed. This is parallel compression. So really you are going to have phase issues and the like, but it can be done easily if you double track or split the signal. i tried using FX and routing but its not very doable in stereo. If it goes out and in and out again I stil do not get parallel compression. Cos i do some ducking with hardware and am always looking into it.
The using two sides of stereo is just splitting stereo signal, but not really like I say you need to do. You need same signal. As there is differences in the stereo inage it means that the signals are slightly different and not the same..... BUT >If I send a mono signal to outs 1 and 2, then this is the way to go. as it allows the exact same signal to be passed,. unlike stereo which will have differences in the stereo field that do not equate to the exact same signal. So it has to be mono in this case and sent to stereo pair out. This is the spiltting you all need to do here. This is the only way besides doubling tracks to make a split signal IMO. I have listened to both channels and it seems to be right when I A/B the signals with double blind test. I have to check what I do in studio, so thats what I did to check that the stereo signal was what I wanted. thanks me later,

Anyway up shot is you have to then return signals but this is where you have to make it both mono returns NOT stereo. This is where 1 FX slot is needed and the input has to be set to two mono in L/R mode. That is in JJOSXL. Obviously you just make one in go through compressor, set in FX slot 1, and the other one does not go through the FX slot with compressor... You can still send both to the second FX that is not being used as well. If you have JJOSXL you can also send it back out to another source as mono or stereo with other outs that you have and send it to mixer fx chain. hell even another compressor or use it as a another side chain. See you have a split signal and its getting summed in the MPC and IS parallel compression. only mono but, but its true parallel as its exact same signal not stereo and of course it all comes out the main outs in stereo. as its a mono signal not stereo it works. Also you still have main out put compressor free to.