You can connect these using 1/4 inch to dual mono 1/4 inch cables.
Sorry to hear you are not satisfied.
I will see if another expert can assist you further.
Hello, my name is Rusty. I'm a sound engineer, I need a little more information. What is the model of your Mackie? Which DAW program are you using, and which operating system on your computer?
Sorry for the questions, but in order to connect your gear properly, it's pretty complicated, so the more I know, the quicker you can start recording.