Using two Channels on Scarlett from Live Participant but only see one channel

[StuartR]

Hi, 
I see that JK 'pre-mixes' the two channels from Scarlett into one before sending it out to the other participants in a live session.  Is it possible to properly mix those two instrument so that the other person hears them in the right balance?  We are not making any progress with this. The participant feed isn't loud enough compared to the person receiving it and we can't balance the guitar and vocal premix.  

It would be helpful to know that it IS possible and then point me in the right direction...the gain knobs on the Focusrite or the channel gain slider on the JK interface or some other way?  Thank you!!

I believe you should set the hardware interface controls for each channel to peak just before clipping as indicated by the level indicators. Then use the JK mixer sliders on each input to set the proper mix and stereo balance you want.