So here is what I need to have hooked into my iMac. 1. External HD one 2. External HD two 3. Apogee One 4. Yamaha KX8 midi controller 5. Printer 6. iPhone Both HD's are backup drives. I'm running a USB splitter on one of the ports. Therefore I have 3 direct USB ports and another 4 on the splitter. First question is how does the splitter degrade the throughput of the USB port? If you have two cables plugged into the splitter, does it cut throughput in half between each peripheral? Second question is which three peripherals should I have plugged into the direct USB's on the iMac? I'm thinking the highest demand ones are the Apogee and the Yamaha. Maybe one of the external HD's?