Reply to HELP!!!! Technical Issues

Okay im trying to figure out the best and most cost efficient (cheapest) way to hook up all my gear up to my KRK Rokit 6 studio monitors. I recently purchased a powered USB hub to run all my devices into my computer. I am now wanting all of them to be able to be played at the same time through the monitors. The gear I have is: 2 KRK Rokit 6 studio monitors, Novation Twitch, M-Audio Venom Synth, Novation Launchpad, Midi Fighter Spectra and my Macbook.

If this is in the wrong community im sorry would you please direct me to the right one.