Install the Asio drivers of your Emi or Motu soundcard into the folder Asio Drivers contained in the Traktor DJ Studio 2 installation folder On your HD browse to the Traktor DJ Studio 2 folder contained in the Applications (Mac OS 9) folder Inside this folder find and the file called Traktor DJ Studio 2.app Ctrl-Click this file and select the option Show Package Content from the context menu A new window pops up showing the contents of the program package Open the folder Contents and then the folder Mac OS 9 From the folder Traktor DJ Studio 2 (line 2.) copy the folder Asio Drivers into the folder Mac OS 9 (line 6.) by Drag-Alt-Drop Finally close the program package by Ctrl-Clicking the file Traktor DJ Studio 2.app a second time and selecting Hide Package Content from the context menu