Reply to USB Port Tip and My First CDJ w/Traktor

Hi

got two things to know

1.is it ok to connect various sources of dj gear s(sound cards,cdjs etc) to a one usb port in the mac....a friend sed to me...keep a one port reserve for the sound card and dont plud anything to that.....??

2.im going to play a party for the first time with cdj 900s....all i need is to install that pioneer aggregate tool to my mac isnt it? there will be no chance to have a check earlier.....so im going connecting them and starts to play

upgrading the cdj 900s to the latest firmware is not problem isnt it?

Mac OS X - 10.7.5

what aggregate tool i have to get...is it

Mac OS Tool for v10.8 or Mac OS Tool for v10.7 or lower version