Things You'll Need
Instructions
Purchase a PlayStation 3 USB hub from a store like Gamestop, Best Buy or online. These hubs operate identically to USB hubs designed for the PC, allowing you to use more USB devices than the console is actually capable of on its own. The makers of "Rock Band" have produced an official hub while other, third-party manufacturers have also released their own versions.
Insert the cable to the USB hub into either of the USB inputs on the front of your PlayStation 2. It doesn't matter which one you use, as the console will recognize the USB hub from either input.
Connect the USB cables from your guitars, microphone and drum kit to the USB inputs on the USB hub. The PlayStation 3 will now be able to recognize all devices and the game itself will allow you to use all instruments simultaneously, should you so choose.