Connect the Project Mix I/O to the computer loaded with SONAR software by using the FireWire cable appropriate for your computer. The Project Mix I/O package contains both 4- and 6-pin connectors.
Enable SONAR mode on the Project Mix I/O by holding down the "AUX 4" button as the unit is powered on. SONAR mode will be confirmed in the display once the unit is initialized.
Open SONAR on your computer after setting the Project Mix I/O in SONAR mode. Once the software has loaded, select "Options" from the toolbar, then click on "Controllers/Surfaces." Click on the Add New Controller/Surface button (a yellow star) and select "Mackie Control" from the drop-down menu. Select "ProjectMix Control Surface MIDI" for input and output settings and click on "Okay." The faders on the Project Mix I/O will move into position, indicating SONAR is now under its control.