So I'm looking to plug in both a mouse and a full sized keyboard, the problem is I have to use an external USB Mic at the same time and I only have 2 ports. I bought a little 4 port hub from the dollarstore, but it doesn't work on my macbook for some reason. (It works on my brothers PC though) Do USB hubs have to be Mac specific? Are there any that would work for around 5$ ish?