[Old Vantaa Man]

Bloody hell mate. You're in a tangle there.

First thing is you should only be using the headphone out on the mixer for monitoring on cans. Get that soundcard out of your life.

Keep it much more simple with your midi i/o. Daisy chain (connect them in series) your synths to each other and use just one midi i/o to the computer.

You can control each synth by setting it and Cubase to respond appropriately to the midi channel numbers that you assign each synth to be sending and receptive on. You'll need to set that on each synth's hardware correspondingly.

Connect the audio outs of each of your synths to the Yamaha and create individual audio channels for each synth/Yammy audio channel in Cubase (CUBASE USERS HELP ME WITH THE TERMINOLOGY HERE) and make sure the OUT is going back to the Yamaha.

EG:
Audio In Channel 1+2 Virus
Audio In Channel 3+4 Korg
Audio In Channel 5+6 Radius

Audio Outs should all be the same channel.


Hardware nerds. Please verify.